Update dependency @angular/core to v15

frontend/package-lock.json

@@ -390,9 +390,9 @@
       }
     },
     "@angular/core": {
-      "version": "14.2.2",
-      "resolved": "https://registry.npmjs.org/@angular/core/-/core-14.2.2.tgz",
-      "integrity": "sha512-kG30b4RqjgWvaH9y4g95JRCzoROV+9/xgFH4hSRejFa/IcapMfvCmONJtJzwTjdsEUQAbiFohF/z9bx3QA/Yvw==",
+      "version": "15.0.0",
+      "resolved": "https://registry.npmjs.org/@angular/core/-/core-15.0.0.tgz",
+      "integrity": "sha512-Hek8L/1XrU1LPN4qmKJiNdYz96ju/yPWvrFjqvrDHjWEenIfxjJohjRwL+ZzICZiEwfnR6y3QGvv4OBY96oTGw==",
       "requires": {
         "tslib": "^2.3.0"
       }

frontend/package.json

@@ -16,7 +16,7 @@
     "@angular/cdk": "^14.0.0",
     "@angular/common": "~14.2.0",
     "@angular/compiler": "~14.2.0",
-    "@angular/core": "~14.2.0",
+    "@angular/core": "~15.0.0",
     "@angular/forms": "~14.2.0",
     "@angular/material": "^14.0.0",
     "@angular/platform-browser": "~14.2.0",