Use npm ci with CI (#1164)

Better use `npm ci`.
https://docs.npmjs.com/cli/ci.html

.github/workflows/tests.yml

@@ -19,7 +19,7 @@ jobs:
         node-version: ${{ matrix.node-version }}
     # Use separate run commands so command status handled correctly on Windows
     - name: npm install
-      run: npm install
+      run: npm ci
     - name: npm test
       run: npm test
     - name: npm run lint