[redis] Add automation

[igaskin]

Relates to https://github.com/endoflife-date/endoflife.date/issues/3261.

Could you help me understand how the automation interacts with the existing redis.json file? There seems to be some unwanted deletions caused by the running redis.py.

Parses the End-of-life schedule from: https://docs.redis.com/latest/rs/installing-upgrading/product-lifecycle/

$ python src/redis.py
::group::redis
6.2: 2024-08-31
6.0: 2022-05-31
5.6: 2021-10-31
5.4: 2020-12-31
5.2: 2019-12-31
::endgroup::