chore(gatsby): upgrade autoprefixer (#10062)

Upgrade autoprefixer to the latest major version. [Release notes](https://github.com/postcss/autoprefixer/releases/tag/9.0.0).

packages/gatsby/package.json

@@ -18,7 +18,7 @@
     "@babel/traverse": "^7.0.0",
     "@reach/router": "^1.1.1",
     "address": "1.0.3",
-    "autoprefixer": "^8.6.5",
+    "autoprefixer": "^9.4.3",
     "babel-core": "7.0.0-bridge.0",
     "babel-eslint": "^9.0.0",
     "babel-loader": "^8.0.0",

yarn.lock

@@ -2588,17 +2588,17 @@ autolinker@~0.15.0:
   resolved "https://registry.yarnpkg.com/autolinker/-/autolinker-0.15.3.tgz#342417d8f2f3461b14cf09088d5edf8791dc9832"
   integrity sha1-NCQX2PLzRhsUzwkIjV7fh5HcmDI=
 
-autoprefixer@^8.6.5:
-  version "8.6.5"
-  resolved "https://registry.yarnpkg.com/autoprefixer/-/autoprefixer-8.6.5.tgz#343f3d193ed568b3208e00117a1b96eb691d4ee9"
-  integrity sha512-PLWJN3Xo/rycNkx+mp8iBDMTm3FeWe4VmYaZDSqL5QQB9sLsQkG5k8n+LNDFnhh9kdq2K+egL/icpctOmDHwig==
+autoprefixer@^9.4.3:
+  version "9.4.3"
+  resolved "https://registry.yarnpkg.com/autoprefixer/-/autoprefixer-9.4.3.tgz#c97384a8fd80477b78049163a91bbc725d9c41d9"
+  integrity sha512-/XSnzDepRkAU//xLcXA/lUWxpsBuw0WiriAHOqnxkuCtzLhaz+fL4it4gp20BQ8n5SyLzK/FOc7A0+u/rti2FQ==
   dependencies:
-    browserslist "^3.2.8"
-    caniuse-lite "^1.0.30000864"
+    browserslist "^4.3.6"
+    caniuse-lite "^1.0.30000921"
     normalize-range "^0.1.2"
     num2fraction "^1.2.2"
-    postcss "^6.0.23"
-    postcss-value-parser "^3.2.3"
+    postcss "^7.0.6"
+    postcss-value-parser "^3.3.1"
 
 aws-sign2@~0.7.0:
   version "0.7.0"
@@ -4089,7 +4089,7 @@ browserify-zlib@^0.2.0:
   dependencies:
     pako "~1.0.5"
 
-browserslist@3.2.8, browserslist@^3.2.6, browserslist@^3.2.8:
+browserslist@3.2.8, browserslist@^3.2.6:
   version "3.2.8"
   resolved "https://registry.yarnpkg.com/browserslist/-/browserslist-3.2.8.tgz#b0005361d6471f0f5952797a76fc985f1f978fc6"
   integrity sha512-WHVocJYavUwVgVViC0ORikPHQquXwVh939TaelZ4WDqpWgTX/FsGhl/+P4qBUAGcRvtOgDgC+xftNWWp2RUTAQ==
@@ -4106,6 +4106,15 @@ browserslist@^4.0.0, browserslist@^4.1.0:
     electron-to-chromium "^1.3.62"
     node-releases "^1.0.0-alpha.11"
 
+browserslist@^4.3.6:
+  version "4.3.7"
+  resolved "https://registry.yarnpkg.com/browserslist/-/browserslist-4.3.7.tgz#f1de479a6466ea47a0a26dcc725e7504817e624a"
+  integrity sha512-pWQv51Ynb0MNk9JGMCZ8VkM785/4MQNXiFYtPqI7EEP0TJO+/d/NqRVn1uiAN0DNbnlUSpL2sh16Kspasv3pUQ==
+  dependencies:
+    caniuse-lite "^1.0.30000925"
+    electron-to-chromium "^1.3.96"
+    node-releases "^1.1.3"
+
 bser@^2.0.0:
   version "2.0.0"
   resolved "https://registry.yarnpkg.com/bser/-/bser-2.0.0.tgz#9ac78d3ed5d915804fd87acb158bc797147a1719"
@@ -4424,11 +4433,16 @@ caniuse-api@^3.0.0:
     lodash.memoize "^4.1.2"
     lodash.uniq "^4.5.0"
 
-caniuse-lite@^1.0.0, caniuse-lite@^1.0.30000844, caniuse-lite@^1.0.30000864, caniuse-lite@^1.0.30000884:
+caniuse-lite@^1.0.0, caniuse-lite@^1.0.30000844, caniuse-lite@^1.0.30000884:
   version "1.0.30000885"
   resolved "https://registry.yarnpkg.com/caniuse-lite/-/caniuse-lite-1.0.30000885.tgz#e889e9f8e7e50e769f2a49634c932b8aee622984"
   integrity sha512-cXKbYwpxBLd7qHyej16JazPoUacqoVuDhvR61U7Fr5vSxMUiodzcYa1rQYRYfZ5GexV03vGZHd722vNPLjPJGQ==
 
+caniuse-lite@^1.0.30000921, caniuse-lite@^1.0.30000925:
+  version "1.0.30000926"
+  resolved "https://registry.yarnpkg.com/caniuse-lite/-/caniuse-lite-1.0.30000926.tgz#4361a99d818ca6e521dbe89a732de62a194a789c"
+  integrity sha512-diMkEvxfFw09SkbErCLmw/1Fx1ZZe9xfWm4aeA2PUffB48x1tfZeMsK5j4BW7zN7Y4PdqmPVVdG2eYjE5IRTag==
+
 capitalize@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/capitalize/-/capitalize-1.0.0.tgz#dc802c580aee101929020d2ca14b4ca8a0ae44be"
@@ -6738,6 +6752,11 @@ electron-to-chromium@^1.3.47, electron-to-chromium@^1.3.62:
   resolved "https://registry.yarnpkg.com/electron-to-chromium/-/electron-to-chromium-1.3.67.tgz#5e8f3ffac89b4b0402c7e1a565be06f3a109abbc"
   integrity sha512-h3zEBLdHvsKfaXv1SHAtykJyNtwYFEKkrWGSFyW1BzGgPQ4ykAzD5Hd8C5MZGTAEhkCKmtyIwYUrapsI0xfKww==
 
+electron-to-chromium@^1.3.96:
+  version "1.3.96"
+  resolved "https://registry.yarnpkg.com/electron-to-chromium/-/electron-to-chromium-1.3.96.tgz#25770ec99b8b07706dedf3a5f43fa50cb54c4f9a"
+  integrity sha512-ZUXBUyGLeoJxp4Nt6G/GjBRLnyz8IKQGexZ2ndWaoegThgMGFO1tdDYID5gBV32/1S83osjJHyfzvanE/8HY4Q==
+
 elegant-spinner@^1.0.1:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/elegant-spinner/-/elegant-spinner-1.0.1.tgz#db043521c95d7e303fd8f345bedc3349cfb0729e"
@@ -13531,6 +13550,13 @@ node-releases@^1.0.0-alpha.11:
   dependencies:
     semver "^5.3.0"
 
+node-releases@^1.1.3:
+  version "1.1.3"
+  resolved "https://registry.yarnpkg.com/node-releases/-/node-releases-1.1.3.tgz#aad9ce0dcb98129c753f772c0aa01360fb90fbd2"
+  integrity sha512-6VrvH7z6jqqNFY200kdB6HdzkgM96Oaj9v3dqGfgp6mF+cHmU4wyQKZ2/WPDRVoR0Jz9KqbamaBN0ZhdUaysUQ==
+  dependencies:
+    semver "^5.3.0"
+
 nomnom@^1.8.1:
   version "1.8.1"
   resolved "https://registry.yarnpkg.com/nomnom/-/nomnom-1.8.1.tgz#2151f722472ba79e50a76fc125bb8c8f2e4dc2a7"
@@ -15150,11 +15176,16 @@ postcss-unique-selectors@^4.0.0:
     postcss "^6.0.0"
     uniqs "^2.0.0"
 
-postcss-value-parser@^3.0.0, postcss-value-parser@^3.2.3, postcss-value-parser@^3.3.0:
+postcss-value-parser@^3.0.0, postcss-value-parser@^3.3.0:
   version "3.3.0"
   resolved "https://registry.yarnpkg.com/postcss-value-parser/-/postcss-value-parser-3.3.0.tgz#87f38f9f18f774a4ab4c8a232f5c5ce8872a9d15"
   integrity sha1-h/OPnxj3dKSrTIojL1xc6IcqnRU=
 
+postcss-value-parser@^3.3.1:
+  version "3.3.1"
+  resolved "https://registry.yarnpkg.com/postcss-value-parser/-/postcss-value-parser-3.3.1.tgz#9ff822547e2893213cf1c30efa51ac5fd1ba8281"
+  integrity sha512-pISE66AbVkp4fDQ7VHBwRNXzAAKJjw4Vw7nWI/+Q3vuly7SNfgYXvm6i5IgFylHGK5sP/xHAbB7N49OS4gWNyQ==
+
 postcss-values-parser@^1.5.0:
   version "1.5.0"
   resolved "https://registry.yarnpkg.com/postcss-values-parser/-/postcss-values-parser-1.5.0.tgz#5d9fa63e2bcb0179ce48f3235303765eb89f3047"
@@ -15201,6 +15232,15 @@ postcss@^7.0.0, postcss@^7.0.1:
     source-map "^0.6.1"
     supports-color "^5.4.0"
 
+postcss@^7.0.6:
+  version "7.0.7"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-7.0.7.tgz#2754d073f77acb4ef08f1235c36c5721a7201614"
+  integrity sha512-HThWSJEPkupqew2fnuQMEI2YcTj/8gMV3n80cMdJsKxfIh5tHf7nM5JigNX6LxVMqo6zkgQNAI88hyFvBk41Pg==
+  dependencies:
+    chalk "^2.4.1"
+    source-map "^0.6.1"
+    supports-color "^5.5.0"
+
 potrace@^2.1.1:
   version "2.1.1"
   resolved "https://registry.yarnpkg.com/potrace/-/potrace-2.1.1.tgz#79111a858197f366418845f667fe8f7fac0a79db"
@@ -18205,7 +18245,7 @@ supports-color@^4.1.0:
   dependencies:
     has-flag "^2.0.0"
 
-supports-color@^5.1.0, supports-color@^5.3.0, supports-color@^5.4.0:
+supports-color@^5.1.0, supports-color@^5.3.0, supports-color@^5.4.0, supports-color@^5.5.0:
   version "5.5.0"
   resolved "https://registry.yarnpkg.com/supports-color/-/supports-color-5.5.0.tgz#e2e69a44ac8772f78a1ec0b35b689df6530efc8f"
   integrity sha512-QjVjwdXIt408MIiAqCX4oUKsgU2EqAGzs2Ppkm4aQYbjm+ZEWEcW4SfFNTr4uMNZma0ey4f5lgLrkB0aX0QMow==