chore(deps-dev): bump postcss from 8.4.8 to 8.4.12

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.8 to 8.4.12.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.8...8.4.12)

---
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

@@ -14,7 +14,7 @@
   "license": "MIT",
   "devDependencies": {
     "nodemon": "^2.0.15",
-    "postcss": "^8.4.8",
+    "postcss": "^8.4.12",
     "postcss-cli": "^9.1.0",
     "standard-version": "^9.3.2",
     "tailwindcss": "^3.0.23",