build(deps): bump @angular/common in /frontend/src/angular

Bumps [@angular/common](https://github.com/angular/angular/tree/HEAD/packages/common) from 20.0.0 to 20.3.14.
- [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/20.3.14/packages/common)

---
updated-dependencies:
- dependency-name: "@angular/common"
  dependency-version: 20.3.14
  dependency-type: direct:production
...

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Author: dependabot[bot]