Bump postcss from 8.3.9 to 8.3.11

Bumps [postcss](https://github.com/postcss/postcss) from 8.3.9 to 8.3.11.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.3.9...8.3.11)

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

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -30,7 +30,7 @@
     "eslint-plugin-nuxt": "^2.0.0",
     "eslint-plugin-prettier": "^3.4.0",
     "jest": "^27.3.1",
-    "postcss": "^8.3.9",
+    "postcss": "^8.3.11",
     "prettier": "^2.4.1",
     "vue-jest": "^3.0.7",
     "@braid/vue-formulate": "^2.5.2",