build(deps-dev): bump @angular/common from 21.0.7 to 21.2.17 in /ng21

Bumps [@angular/common](https://github.com/angular/angular/tree/HEAD/packages/common) from 21.0.7 to 21.2.17.
- [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/v21.2.17/packages/common)

---
updated-dependencies:
- dependency-name: "@angular/common"
  dependency-version: 21.2.17
  dependency-type: direct:development
...

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

Author: dependabot[bot]

ng21/package-lock.json

@@ -10,7 +10,7 @@
   "devDependencies": {
     "@angular-devkit/build-angular": "^21.0.0",
     "@angular/cli": "^21.0.0",
-    "@angular/common": "^21.0.0",
+    "@angular/common": "^21.2.17",
     "@angular/compiler": "^21.0.0",
     "@angular/compiler-cli": "^21.0.0",
     "@angular/core": "^21.0.0",