build(deps-dev): bump the angular-stack group with 2 updates

Bumps the angular-stack group with 2 updates: [@angular/build](https://github.com/angular/angular-cli) and [@angular/cli](https://github.com/angular/angular-cli).


Updates `@angular/build` from 21.2.19 to 21.2.20
- [Release notes](https://github.com/angular/angular-cli/releases)
- [Changelog](https://github.com/angular/angular-cli/blob/main/CHANGELOG.md)
- [Commits](angular/angular-cli@v21.2.19...v21.2.20)

Updates `@angular/cli` from 21.2.19 to 21.2.20
- [Release notes](https://github.com/angular/angular-cli/releases)
- [Changelog](https://github.com/angular/angular-cli/blob/main/CHANGELOG.md)
- [Commits](angular/angular-cli@v21.2.19...v21.2.20)

---
updated-dependencies:
- dependency-name: "@angular/build"
  dependency-version: 21.2.20
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: angular-stack
- dependency-name: "@angular/cli"
  dependency-version: 21.2.20
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: angular-stack
...

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

Author: dependabot[bot]