Bump tar and @angular/cli in /bytefy.webapp

Bumps [tar](https://github.com/isaacs/node-tar) to 7.5.9 and updates ancestor dependency [@angular/cli](https://github.com/angular/angular-cli). These dependencies need to be updated together.


Updates `tar` from 7.4.3 to 7.5.9
- [Release notes](https://github.com/isaacs/node-tar/releases)
- [Changelog](https://github.com/isaacs/node-tar/blob/main/CHANGELOG.md)
- [Commits](https://github.com/isaacs/node-tar/compare/v7.4.3...v7.5.9)

Updates `@angular/cli` from 19.1.4 to 21.1.4
- [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/19.1.4...v21.1.4)

---
updated-dependencies:
- dependency-name: tar
  dependency-version: 7.5.9
  dependency-type: indirect
- dependency-name: "@angular/cli"
  dependency-version: 21.1.4
  dependency-type: direct:development
...

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

bytefy.webapp/package.json

@@ -34,7 +34,7 @@
   },
   "devDependencies": {
     "@angular-devkit/build-angular": "^19.1.4",
-    "@angular/cli": "^19.1.4",
+    "@angular/cli": "^21.1.4",
     "@angular/compiler-cli": "^19.1.3",
     "@types/jasmine": "~5.1.0",
     "jasmine-core": "~5.1.0",