Bump @angular/compiler from 20.3.16 to 20.3.18 in /angular-20-example

Bumps [@angular/compiler](https://github.com/angular/angular/tree/HEAD/packages/compiler) from 20.3.16 to 20.3.18.
- [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/v20.3.18/packages/compiler)

---
updated-dependencies:
- dependency-name: "@angular/compiler"
  dependency-version: 20.3.18
  dependency-type: direct:production
...

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

Author: dependabot[bot]

angular-20-example/package-lock.json

@@ -12,7 +12,7 @@
   "dependencies": {
     "@angular/animations": "^20.3.16",
     "@angular/common": "^20.3.16",
-    "@angular/compiler": "^20.3.16",
+    "@angular/compiler": "^20.3.18",
     "@angular/core": "^20.3.18",
     "@angular/forms": "^20.3.16",
     "@angular/platform-browser": "^20.3.16",