Bump postcss from 8.5.10 to 8.5.18

Bumps [postcss](https://github.com/postcss/postcss) from 8.5.10 to 8.5.18.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.5.10...8.5.18)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.18
  dependency-type: direct:development
...

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

Author: dependabot[bot]

package.json

@@ -31,7 +31,7 @@
     "eslint-plugin-simple-import-sort": "^12.1.1",
     "eslint-plugin-vue": "^10.8.0",
     "globals": "^17.4.0",
-    "postcss": "^8.5.10",
+    "postcss": "^8.5.18",
     "postcss-cli": "^11.0.1",
     "postcss-prefixwrap": "^1.57.2",
     "postcss-relative-rem": "^1.0.0",