`local_container_links` example doesn't support `python>=3.11` due to old `bottle-redis` dependency.

The [`bottle-redis`](https://github.com/bottlepy/bottle-redis) dependency used in [`local_container_links`](https://github.com/google-deepmind/xmanager/tree/7a9cfd0b1edf777cd4b10b9f81ab3a8a8bbdc9ec/examples/local_container_links) example is almost [10 years old](https://pypi.org/project/bottle-redis/#history) and does not support `python>=3.11`. It would be nice to replace the package so that a newer python versions can be used. `bottle-redis` functionality is quite trivial and would only require minor changes in `server.py` to work without it.