chore(deps): bump postcss and @angular-devkit/build-angular

Bumps [postcss](https://github.com/postcss/postcss) to 8.4.31 and updates ancestor dependency [@angular-devkit/build-angular](https://github.com/angular/angular-cli). These dependencies need to be updated together.


Updates `postcss` from 8.4.27 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@8.4.27...8.4.31)

Updates `@angular-devkit/build-angular` from 16.2.1 to 16.2.6
- [Release notes](https://github.com/angular/angular-cli/releases)
- [Changelog](https://github.com/angular/angular-cli/blob/main/CHANGELOG.md)
- [Commits](angular/angular-cli@16.2.1...16.2.6)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: indirect
- dependency-name: "@angular-devkit/build-angular"
  dependency-type: direct:development
...

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

package.json

@@ -52,7 +52,7 @@
     "zone.js": "0.13.0"
   },
   "devDependencies": {
-    "@angular-devkit/build-angular": "16.2.1",
+    "@angular-devkit/build-angular": "16.2.6",
     "@angular-devkit/core": "16.2.1",
     "@angular-devkit/schematics": "16.2.1",
     "@angular-eslint/eslint-plugin": "16.1.1",