[deps]: Update angular-cli monorepo to v21

package.json

@@ -73,15 +73,15 @@
     "test:types": "npx tsc --noEmit"
   },
   "devDependencies": {
-    "@angular-devkit/build-angular": "20.3.3",
+    "@angular-devkit/build-angular": "21.0.4",
     "@angular-eslint/eslint-plugin-template": "20.7.0",
     "@angular-eslint/template-parser": "20.7.0",
-    "@angular/compiler-cli": "21.0.6",
+    "@angular/compiler-cli": "20.3.15",
     "@electron/notarize": "2.5.0",
     "@electron/rebuild": "4.0.1",
     "@fluffy-spoon/substitute": "1.208.0",
     "@microsoft/microsoft-graph-types": "2.43.1",
-    "@ngtools/webpack": "20.3.3",
+    "@ngtools/webpack": "21.0.4",
     "@types/inquirer": "8.2.10",
     "@types/jest": "29.5.14",
     "@types/lowdb": "1.0.15",
@@ -143,16 +143,16 @@
     "zone.js": "0.15.1"
   },
   "dependencies": {
-    "@angular/animations": "21.0.6",
+    "@angular/animations": "20.3.15",
     "@angular/cdk": "20.2.14",
-    "@angular/cli": "20.3.3",
-    "@angular/common": "21.0.6",
-    "@angular/compiler": "21.0.6",
-    "@angular/core": "21.0.6",
-    "@angular/forms": "21.0.6",
-    "@angular/platform-browser": "21.0.6",
-    "@angular/platform-browser-dynamic": "21.0.6",
-    "@angular/router": "21.0.6",
+    "@angular/cli": "21.0.4",
+    "@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",
     "@microsoft/microsoft-graph-client": "3.0.7",
     "big-integer": "1.6.52",
     "bootstrap": "5.3.7",