build(deps): bump @angular/compiler (#23241)

Bumps [@angular/compiler](https://github.com/angular/angular/tree/HEAD/packages/compiler) from 19.2.18 to 19.2.20.
- [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/v19.2.20/packages/compiler)

---
updated-dependencies:
- dependency-name: "@angular/compiler"
  dependency-version: 19.2.20
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

samples/client/petstore/typescript-angular-v19/package-lock.json

@@ -12,7 +12,7 @@
   "dependencies": {
     "@angular/animations": "^19.0.0",
     "@angular/common": "^19.0.0",
-    "@angular/compiler": "^19.2.18",
+    "@angular/compiler": "^19.2.20",
     "@angular/core": "^19.2.20",
     "@angular/forms": "^19.0.0",
     "@angular/platform-browser": "^19.0.0",