Update angular monorepo to v21

Author: renovate[bot]

package.json

@@ -45,13 +45,13 @@
   },
   "homepage": "https://github.com/esm-bundle/angular__upgrade#readme",
   "devDependencies": {
-    "@angular/common": "15.2.10",
-    "@angular/compiler": "15.2.10",
-    "@angular/compiler-cli": "15.2.10",
-    "@angular/core": "15.2.10",
-    "@angular/platform-browser": "15.2.10",
-    "@angular/platform-browser-dynamic": "15.2.10",
-    "@angular/upgrade": "15.2.10",
+    "@angular/common": "21.2.7",
+    "@angular/compiler": "21.2.7",
+    "@angular/compiler-cli": "21.2.7",
+    "@angular/core": "21.2.7",
+    "@angular/platform-browser": "21.2.7",
+    "@angular/platform-browser-dynamic": "21.2.7",
+    "@angular/upgrade": "21.2.7",
     "@rollup/plugin-babel": "6.0.4",
     "@rollup/plugin-node-resolve": "15.2.3",
     "concurrently": "8.2.2",