build(deps-dev): bump postcss from 8.5.8 to 8.5.13

Bumps [postcss](https://github.com/postcss/postcss) from 8.5.8 to 8.5.13.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.5.8...8.5.13)

---
updated-dependencies:
- dependency-name: postcss
  dependency-version: 8.5.13
  dependency-type: direct:development
...

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

Author: dependabot[bot]

package-lock.json

@@ -97,7 +97,7 @@
     "magic-string": "^0.30.17",
     "mock-socket": "^9.3.1",
     "nyc": "^18.0.0",
-    "postcss": "^8.3.6",
+    "postcss": "^8.5.13",
     "rimraf": "^6.0.1",
     "sass": "^1.42.1",
     "shelljs": "^0.10.0",