Bump rxjs from 7.8.0 to 7.8.1 in /frontend (#167)

Bumps [rxjs](https://github.com/reactivex/rxjs) from 7.8.0 to 7.8.1.
- [Changelog](https://github.com/ReactiveX/rxjs/blob/7.8.1/CHANGELOG.md)
- [Commits](https://github.com/reactivex/rxjs/compare/7.8.0...7.8.1)

---
updated-dependencies:
- dependency-name: rxjs
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

frontend/package.json

@@ -23,7 +23,7 @@
     "@angular/router": "^15.2.6",
     "@angular/youtube-player": "^15.2.6",
     "mat-table-filter": "^15.0.0",
-    "rxjs": "~7.8.0",
+    "rxjs": "~7.8.1",
     "tslib": "^2.3.0",
     "zone.js": "~0.13.0"
   },