Bump guava from 23.6-android to 27.1-android (#1324)
Bump guava from 23.6-android to 27.1-android (#1324)

Bumps [guava](https://github.com/google/guava) from 23.6-android to 27.1-android.
- [Release notes](https://github.com/google/guava/releases)
- [Commits](https://github.com/google/guava/commits)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
syncthing/syncthing-android,Nutomic/syncthing-android,syncthing/syncthing-android,syncthing/syncthing-android,Nutomic/syncthing-android