build(deps): bump rxjs from 7.5.5 to 7.8.0

Bumps [rxjs](https://github.com/reactivex/rxjs) from 7.5.5 to 7.8.0.
- [Release notes](https://github.com/reactivex/rxjs/releases)
- [Changelog](https://github.com/ReactiveX/rxjs/blob/master/CHANGELOG.md)
- [Commits](ReactiveX/rxjs@7.5.5...7.8.0)

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

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