chore: angular 21 support

Author: BitsAndDroids

projects/schedule-x/angular/package.json

@@ -10,8 +10,8 @@
   },
   "version": "0.0.1",
   "peerDependencies": {
-    "@angular/common": "14 - 20",
-    "@angular/core": "14 - 20",
+    "@angular/common": "14 - 21",
+    "@angular/core": "14 - 21",
     "@schedule-x/calendar": "^3.3.0"
   },
   "dependencies": {