mgr/dashboard: bump @angular/forms in /src/pybind/mgr/dashboard/frontend

Bumps [@angular/forms](https://github.com/angular/angular/tree/HEAD/packages/forms) from 15.2.9 to 18.2.6.
- [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/18.2.6/packages/forms)

---
updated-dependencies:
- dependency-name: "@angular/forms"
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Diff for: src/pybind/mgr/dashboard/frontend/package-lock.json

@@ -48,7 +48,7 @@
     "@angular/common": "15.2.9",
     "@angular/compiler": "15.2.9",
     "@angular/core": "15.2.9",
-    "@angular/forms": "15.2.9",
+    "@angular/forms": "18.2.6",
     "@angular/localize": "15.2.9",
     "@angular/platform-browser": "15.2.9",
     "@angular/platform-browser-dynamic": "15.2.9",