Bump @angular/common from 20.3.15 to 21.0.5 in /web_embedding/ng-flutter

Bumps [@angular/common](https://github.com/angular/angular/tree/HEAD/packages/common) from 20.3.15 to 21.0.5.
- [Release notes](https://github.com/angular/angular/releases)
- [Changelog](https://github.com/angular/angular/blob/main/CHANGELOG.md)
- [Commits](https://github.com/angular/angular/commits/v21.0.5/packages/common)

---
updated-dependencies:
- dependency-name: "@angular/common"
  dependency-version: 21.0.5
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

web_embedding/ng-flutter/package.json

@@ -13,7 +13,7 @@
   "dependencies": {
     "@angular/animations": "^20.0.3",
     "@angular/cdk": "^20.1.0",
-    "@angular/common": "^20.1.4",
+    "@angular/common": "^21.0.5",
     "@angular/compiler": "^20.0.6",
     "@angular/core": "^20.0.3",
     "@angular/forms": "^20.1.2",