Bump minimatch and @angular-devkit/build-angular in /webapp/frontend

Bumps [minimatch](https://github.com/isaacs/minimatch) to 3.1.5 and updates ancestor dependencies [minimatch](https://github.com/isaacs/minimatch) and [@angular-devkit/build-angular](https://github.com/angular/angular-cli). These dependencies need to be updated together.


Updates `minimatch` from 3.0.5 to 3.1.5
- [Changelog](https://github.com/isaacs/minimatch/blob/main/changelog.md)
- [Commits](https://github.com/isaacs/minimatch/compare/v3.0.5...v3.1.5)

Updates `minimatch` from 5.1.6 to 5.1.9
- [Changelog](https://github.com/isaacs/minimatch/blob/main/changelog.md)
- [Commits](https://github.com/isaacs/minimatch/compare/v3.0.5...v3.1.5)

Updates `@angular-devkit/build-angular` from 13.3.11 to 21.2.0
- [Release notes](https://github.com/angular/angular-cli/releases)
- [Changelog](https://github.com/angular/angular-cli/blob/main/CHANGELOG.md)
- [Commits](https://github.com/angular/angular-cli/compare/13.3.11...v21.2.0)

---
updated-dependencies:
- dependency-name: minimatch
  dependency-version: 3.1.5
  dependency-type: indirect
- dependency-name: minimatch
  dependency-version: 5.1.9
  dependency-type: indirect
- dependency-name: "@angular-devkit/build-angular"
  dependency-version: 21.2.0
  dependency-type: direct:development
...

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

webapp/frontend/package.json

@@ -47,7 +47,7 @@
         "web-animations-js": "^2.3.2"
     },
     "devDependencies": {
-        "@angular-devkit/build-angular": "v13-lts",
+        "@angular-devkit/build-angular": "v21-lts",
         "@angular/cli": "v13-lts",
         "@angular/compiler-cli": "v13-lts",
         "@angular/language-service": "v13-lts",