build(deps): bump @angular/compiler

Bumps [@angular/compiler](https://github.com/angular/angular/tree/HEAD/packages/compiler) from 20.0.1 to 20.3.15.
- [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/20.3.15/packages/compiler)

---
updated-dependencies:
- dependency-name: "@angular/compiler"
  dependency-version: 20.3.15
  dependency-type: direct:production
...

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

Author: dependabot[bot]

flightSelection-frontend/src/angular/package-lock.json

@@ -23,7 +23,7 @@
     "@angular/animations": "^20.0.1",
     "@angular/cdk": "^20.0.2",
     "@angular/common": "^20.0.1",
-    "@angular/compiler": "^20.0.1",
+    "@angular/compiler": "^20.3.15",
     "@angular/core": "^20.0.1",
     "@angular/forms": "^20.0.1",
     "@angular/material": "^20.0.2",