revert: use stable ng schematics packages

Author: Lipata

packages/ng-schematics/package.json

@@ -18,11 +18,11 @@
   "license": "MIT",
   "schematics": "./src/collection.json",
   "dependencies": {
-    "@angular-devkit/core": "^21.0.0",
-    "@angular-devkit/schematics": "^21.0.0",
+    "@angular-devkit/core": "^19.0.0",
+    "@angular-devkit/schematics": "^19.0.0",
     "@igniteui/angular-templates": "~21.0.1480-beta.0",
     "@igniteui/cli-core": "~14.8.0-beta.0",
-    "@schematics/angular": "~21.0.0",
+    "@schematics/angular": "~19.0.0",
     "minimatch": "^10.0.1",
     "rxjs": "^7.8.1"
   },