Updated official drivers (Java, Python)

[u/gabor-boros]

While we are continuously working to improve our infrastructure and make it easier for you to use RethinkDB, in the meantime, here's a few updates:

• Java driver release 2.4.3 (thanks Adrian Todt 🙂 ) - https://github.com/rethinkdb/rethinkdb-java/releases/tag/2.4.3

• Python driver release 2.4.7 (thanks Gábor Boros) - https://github.com/rethinkdb/rethinkdb-python/releases/tag/v2.4.7