Bump @angular/cli in /openc3/templates/tool_angular

Bumps [@angular/cli](https://github.com/angular/angular-cli) from 18.2.21 to 21.2.5.
- [Release notes](https://github.com/angular/angular-cli/releases)
- [Changelog](https://github.com/angular/angular-cli/blob/main/CHANGELOG.md)
- [Commits](angular/angular-cli@18.2.21...v21.2.5)

---
updated-dependencies:
- dependency-name: "@angular/cli"
  dependency-version: 21.2.5
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

openc3/templates/tool_angular/package.json

@@ -33,7 +33,7 @@
   "devDependencies": {
     "@angular-builders/custom-webpack": "^18.0.0",
     "@angular-devkit/build-angular": "^18.2.6",
-    "@angular/cli": "~18.2.6",
+    "@angular/cli": "~21.2.5",
     "@angular/compiler-cli": "^18.2.6",
     "@types/jasmine": "~5.1.4",
     "jasmine-core": "~5.4.0",