chore(deps-dev): bump @angular/compiler-cli from 20.1.4 to 21.2.6

Bumps [@angular/compiler-cli](https://github.com/angular/angular/tree/HEAD/packages/compiler-cli) from 20.1.4 to 21.2.6.
- [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/v21.2.6/packages/compiler-cli)

---
updated-dependencies:
- dependency-name: "@angular/compiler-cli"
  dependency-version: 21.2.6
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

packages/angular-standalone-test-app/package.json

@@ -39,7 +39,7 @@
   "devDependencies": {
     "@angular-devkit/build-angular": "^20.1.4",
     "@angular/cli": "^20.1.4",
-    "@angular/compiler-cli": "^20.1.4",
+    "@angular/compiler-cli": "^21.2.6",
     "@playwright/test": "catalog:",
     "@types/jasmine": "~5.1.4",
     "@types/node": "^20.16.0",

packages/angular-test-app/package.json

@@ -41,7 +41,7 @@
   "devDependencies": {
     "@angular-devkit/build-angular": "^20.1.4",
     "@angular/cli": "^20.1.4",
-    "@angular/compiler-cli": "^20.1.4",
+    "@angular/compiler-cli": "^21.2.6",
     "@playwright/test": "catalog:",
     "@types/jasmine": "~5.1.4",
     "@types/node": "^20.16.0",

packages/angular/package.json

@@ -28,7 +28,7 @@
     "@angular/animations": "^20.1.4",
     "@angular/common": "^20.3.14",
     "@angular/compiler": "^20.3.18",
-    "@angular/compiler-cli": "^20.1.4",
+    "@angular/compiler-cli": "^21.2.6",
     "@angular/core": "^20.3.18",
     "@angular/forms": "^20.1.4",
     "@angular/platform-browser": "^20.1.4",