Bump postcss from 8.4.5 to 8.4.31

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.5 to 8.4.31.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.5...8.4.31)

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

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

Author: dependabot[bot]

package-lock.json

@@ -113,7 +113,7 @@
     "karma-spec-reporter": "0.0.32",
     "license-checker": "25.0.1",
     "mocha": "9.1.3",
-    "postcss": "8.4.5",
+    "postcss": "8.4.31",
     "cssnano": "5.1.14",
     "cssnano-preset-lite": "2.1.3",
     "puppeteer-core": "22.3.0",