Bump @apollo/client from 3.13.9 to 4.0.6 in /frontend

Bumps [@apollo/client](https://github.com/apollographql/apollo-client) from 3.13.9 to 4.0.6.
- [Release notes](https://github.com/apollographql/apollo-client/releases)
- [Changelog](https://github.com/apollographql/apollo-client/blob/main/CHANGELOG.md)
- [Commits](https://github.com/apollographql/apollo-client/compare/v3.13.9...@apollo/[email protected])

---
updated-dependencies:
- dependency-name: "@apollo/client"
  dependency-version: 4.0.6
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

frontend/package-lock.json

@@ -25,7 +25,7 @@
     "@angular/platform-browser": "^20.3.1",
     "@angular/platform-browser-dynamic": "^20.3.1",
     "@angular/router": "^20.3.1",
-    "@apollo/client": "^3.13.9",
+    "@apollo/client": "^4.0.6",
     "@ngrx/signals": "^20.0.0",
     "apollo-angular": "^11.0.0",
     "echarts": "^6.0.0",