Merge pull request #529 from mozilla-frontend-infra/renovate/optimize-css-assets-webpack-plugin-6.x

fix(deps): update dependency optimize-css-assets-webpack-plugin to v6

Author: lotas

package.json

@@ -78,7 +78,7 @@
     "lodash.uniqby": "^4.7.0",
     "mdi-react": "^7.0.0",
     "mini-css-extract-plugin": "1.6.2",
-    "optimize-css-assets-webpack-plugin": "5.0.8",
+    "optimize-css-assets-webpack-plugin": "6.0.1",
     "pnp-webpack-plugin": "1.7.0",
     "postcss-flexbugs-fixes": "4.2.1",
     "postcss-loader": "3.0.0",