Bump postcss and web-ext

Bumps [postcss](https://github.com/postcss/postcss) to 8.4.33 and updates ancestor dependency [web-ext](https://github.com/mozilla/web-ext). These dependencies need to be updated together.


Updates `postcss` from 8.4.21 to 8.4.33
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](https://github.com/postcss/postcss/compare/8.4.21...8.4.33)

Updates `web-ext` from 7.6.2 to 7.10.0
- [Release notes](https://github.com/mozilla/web-ext/releases)
- [Commits](https://github.com/mozilla/web-ext/compare/7.6.2...7.10.0)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: indirect
- dependency-name: web-ext
  dependency-type: direct:development
...

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

package.json

@@ -38,7 +38,7 @@
     "ts-loader": "^9.4.2",
     "ts-node": "^10.9.1",
     "typescript": "4.9",
-    "web-ext": "^7.6.2",
+    "web-ext": "^7.10.0",
     "webpack": "^5.75.0",
     "webpack-cli": "^4.10.0",
     "webpack-merge": "^5.8.0"