Update angular-cli monorepo to v21

Author: supply-chain-sentinel[bot]

package.json

@@ -31,10 +31,10 @@
   },
   "devDependencies": {
     "@angular-devkit/architect": "~0.12.3",
-    "@angular-devkit/build-angular": "~0.12.3",
-    "@angular-devkit/core": "~7.2.3",
-    "@angular-devkit/schematics": "~7.2.3",
-    "@angular/cli": "~7.2.3",
+    "@angular-devkit/build-angular": "~21.2.0",
+    "@angular-devkit/core": "~21.2.0",
+    "@angular-devkit/schematics": "~21.2.0",
+    "@angular/cli": "~21.2.0",
     "@angular/compiler": "~7.2.2",
     "@angular/compiler-cli": "~7.2.2",
     "@angular/language-service": "~7.2.2",