chore(deps)(deps): Bump @angular/core from 21.1.5 to 21.1.6 in /frontend (#311)

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Author: dependabot[bot]

frontend/package-lock.json

@@ -38,7 +38,7 @@
     "@angular/common": "^21.1.5",
     "@angular/compiler": "^21.1.5",
     "@angular/forms": "^21.1.5",
-    "@angular/core": "^21.1.5",
+    "@angular/core": "^21.1.6",
     "@angular/material": "^21.1.5",
     "@angular/platform-browser": "^21.1.5",
     "@angular/router": "^21.1.5",