fix(@ngtools/webpack): update Angular peer dependencies to 11 stable

Author: clydin

packages/ngtools/webpack/package.json

@@ -26,7 +26,7 @@
     "webpack-sources": "2.0.1"
   },
   "peerDependencies": {
-    "@angular/compiler-cli": "^11.0.0 || ^11.0.0-next",
+    "@angular/compiler-cli": "^11.0.0",
     "typescript": "~4.0.0",
     "webpack": "^4.0.0"
   },