build(deps): bump @angular/compiler in /frontend/src/angular

---
updated-dependencies:
- dependency-name: "@angular/compiler"
  dependency-version: 21.2.4
  dependency-type: direct:production
...

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

Author: dependabot[bot]

frontend/src/angular/package-lock.json

@@ -23,7 +23,7 @@
     "@angular/animations": "^21.0.3",
     "@angular/cdk": "^21.0.2",
     "@angular/common": "^21.0.3",
-    "@angular/compiler": "^21.0.3",
+    "@angular/compiler": "^21.2.4",
     "@angular/core": "^21.0.3",
     "@angular/forms": "^21.0.3",
     "@angular/localize": "^21.0.3",