Bump @angular/compiler-cli from 15.2.6 to 15.2.8 in /frontend (#144)

Bumps [@angular/compiler-cli](https://github.com/angular/angular/tree/HEAD/packages/compiler-cli) from 15.2.6 to 15.2.8.
- [Release notes](https://github.com/angular/angular/releases)
- [Changelog](https://github.com/angular/angular/blob/main/CHANGELOG.md)
- [Commits](https://github.com/angular/angular/commits/15.2.8/packages/compiler-cli)

---
updated-dependencies:
- dependency-name: "@angular/compiler-cli"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

frontend/package.json

@@ -30,7 +30,7 @@
   "devDependencies": {
     "@angular-devkit/build-angular": "^15.2.5",
     "@angular/cli": "~15.2.5",
-    "@angular/compiler-cli": "^15.2.6",
+    "@angular/compiler-cli": "^15.2.8",
     "@types/jasmine": "~4.0.0",
     "jasmine-core": "~4.6.0",
     "karma": "~6.4.1",