fix: bump postcss from 8.3.6 to 8.3.8 (#32)

Bumps [postcss](https://github.com/postcss/postcss) from 8.3.6 to 8.3.8.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.3.6...8.3.8)

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

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

package.json

@@ -36,7 +36,7 @@
     "hosted-git-info": "4.0.2",
     "normalize-url": "7.0.2",
     "path-parse": "1.0.7",
-    "postcss": "8.3.6",
+    "postcss": "8.3.8",
     "trim-newlines": "4.0.2"
   },
   "devDependencies": {