build(deps-dev): bump postcss from 8.4.4 to 8.4.31

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.4 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@8.4.4...8.4.31)

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

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

package.json

@@ -46,7 +46,7 @@
         "lodash": "^4.17.19",
         "moment": "^2.10.6",
         "moment-timezone": "^0.5.21",
-        "postcss": "^8.3.6",
+        "postcss": "^8.4.31",
         "prettier": "^2.3.2",
         "prettier-eslint-cli": "^5.0.1",
         "tailwindcss": "^2.2.7",