[deps]: Update angular monorepo to v21

Author: renovate[bot]

package.json

@@ -76,7 +76,7 @@
     "@angular-devkit/build-angular": "20.3.3",
     "@angular-eslint/eslint-plugin-template": "20.7.0",
     "@angular-eslint/template-parser": "20.7.0",
-    "@angular/compiler-cli": "20.3.15",
+    "@angular/compiler-cli": "21.0.4",
     "@electron/notarize": "2.5.0",
     "@electron/rebuild": "4.0.1",
     "@fluffy-spoon/substitute": "1.208.0",
@@ -142,16 +142,16 @@
     "zone.js": "0.15.1"
   },
   "dependencies": {
-    "@angular/animations": "20.3.15",
+    "@angular/animations": "21.0.4",
     "@angular/cdk": "20.2.14",
     "@angular/cli": "20.3.3",
-    "@angular/common": "20.3.15",
-    "@angular/compiler": "20.3.15",
-    "@angular/core": "20.3.15",
-    "@angular/forms": "20.3.15",
-    "@angular/platform-browser": "20.3.15",
-    "@angular/platform-browser-dynamic": "20.3.15",
-    "@angular/router": "20.3.15",
+    "@angular/common": "21.0.4",
+    "@angular/compiler": "21.0.4",
+    "@angular/core": "21.0.4",
+    "@angular/forms": "21.0.4",
+    "@angular/platform-browser": "21.0.4",
+    "@angular/platform-browser-dynamic": "21.0.4",
+    "@angular/router": "21.0.4",
     "@microsoft/microsoft-graph-client": "3.0.7",
     "big-integer": "1.6.52",
     "bootstrap": "5.3.7",