chore: update CHANGELOG.md

CHANGELOG.md

@@ -1,3 +1,26 @@
+# 12.3.0
+
+### :rocket: Enhancement
+- More color utilities! [#760](https://github.com/primer/css/pull/760) ([@shawnbot](https://github.com/shawnbot))
+- Add pink to Primer! 💖🌸💕🌷💞🎀💗🌺💝 [#776](https://github.com/primer/css/pull/776), [#778](https://github.com/primer/css/pull/778) ([@emplums](https://github.com/emplums)))
+
+### :house: Internal
+- Update storybook [#777](https://github.com/primer/css/pull/777) ([@emplums](https://github.com/emplums))
+- Add bundle size report [#772](https://github.com/primer/css/pull/772) ([@shawnbot](https://github.com/shawnbot))
+
+### :memo: Documentation
+- Update Primer references to Primer CSS [#771](https://github.com/primer/css/pull/771) ([@emplums](https://github.com/emplums))
+- Add Edit on GitHub links to docs [#770](https://github.com/primer/css/pull/770) ([@emplums](https://github.com/emplums))
+- Anchor Link in Docs [#768](https://github.com/primer/css/pull/768) ([@emplums](https://github.com/emplums))
+
+### :house: Internal
+- Update RELEASING [#757](https://github.com/primer/css/pull/757) ([@simurai](https://github.com/simurai))
+
+### Committers
+- [@emplums](https://github.com/emplums)
+- [@shawnbot](https://github.com/shawnbot)
+- [@simurai](https://github.com/simurai)
+
 # 12.2.3
 
 ### :bug: Bug Fix