docs: bump VSCode extension version to 21.0.0

cherrypick notes into main (and version bump)

Author: atscott

vscode-ng-language-service/CHANGELOG.md

@@ -1,3 +1,8 @@
+## 21.0.0 (2025-11-18)
+
+- fix(language-service): address potential memory leak during project creation (89095946cf)[https://github.com/angular/angular/commit/89095946cff051c5613b8f54ec722d08cd47c709]
+- fix(language-server): fix directory renaming on Windows (3f7111a9c3)[https://github.com/angular/angular/commit/3f7111a9c38c6fd00af705a3045f2909f47b505b]
+
 # 20.3.3
 
 | Commit                                                                                           | Type | Description                                                                                                                  |

vscode-ng-language-service/package.json

@@ -2,7 +2,7 @@
   "name": "ng-template",
   "displayName": "Angular Language Service",
   "description": "Editor services for Angular templates",
-  "version": "20.3.3",
+  "version": "21.0.0",
   "private": true,
   "publisher": "Angular",
   "icon": "angular.png",
@@ -288,4 +288,4 @@
     "url": "https://github.com/angular/angular.git",
     "directory": "vscode-ng-language-service"
   }
-}
+}