Bump postcss from 8.4.31 to 8.5.10 (#40)

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.31 to 8.5.10.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.31...8.5.10)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.10
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package.json

@@ -17,7 +17,7 @@
     "mensch": "^0.3.4",
     "node-sass": "^9.0.0",
     "parserlib": "^1.1.1",
-    "postcss": "^8.4.31",
+    "postcss": "^8.5.10",
     "postcss-mixins": "^9.0.4",
     "postcss-nested": "^6.0.1",
     "postcss-selector-parser": "^6.0.13",