Bump postcss from 8.4.19 to 8.4.23

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.19 to 8.4.23.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.19...8.4.23)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -57,7 +57,7 @@
   "devDependencies": {
     "autoprefixer": "^10.4.2",
     "gh-pages": "^5.0.0",
-    "postcss": "^8.4.7",
+    "postcss": "^8.4.23",
     "tailwindcss": "^3.3.1"
   }
 }

yarn.lock

@@ -7891,7 +7891,7 @@ postcss@^7.0.35:
     picocolors "^0.2.1"
     source-map "^0.6.1"
 
-postcss@^8.0.9, postcss@^8.3.5, postcss@^8.4.18, postcss@^8.4.4, postcss@^8.4.7:
+postcss@^8.0.9, postcss@^8.3.5, postcss@^8.4.18, postcss@^8.4.23, postcss@^8.4.4:
   version "8.4.23"
   resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.23.tgz#df0aee9ac7c5e53e1075c24a3613496f9e6552ab"
   integrity sha512-bQ3qMcpF6A/YjR55xtoTr0jGOlnPOKAIMdOWiv0EIT6HVPEaJiJB4NLljSbiHoC2RX7DN5Uvjtpbg1NPdwv1oA==