build(deps): Bump com.github.nextcloud:Android-SingleSignOn

Bumps [com.github.nextcloud:Android-SingleSignOn](https://github.com/nextcloud/Android-SingleSignOn) from 0.7.0 to 0.8.1.
- [Release notes](https://github.com/nextcloud/Android-SingleSignOn/releases)
- [Commits](https://github.com/nextcloud/Android-SingleSignOn/compare/0.7.0...0.8.1

)

---
updated-dependencies:
- dependency-name: com.github.nextcloud:Android-SingleSignOn
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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