Make it possible to customize SSL ciphers (redis#3212)

Given that Python 3.10 changed the default list of TLS ciphers, it is a
good idea to allow customization of the list of ciphers when using
Redis with TLS. In some situations the client is unusable right now
with older servers and Python >= 3.10.

Also whitelist a dev dependency vulnerability, and bump version to 5.0.4.

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Co-authored-by: Gabriel Erzse <[email protected]>

Version 5.0.3 (redis#3179)

Version 5.1.0b4 (redis#3166)

Version 5.0.2 (redis#3164)

Version 5.1.0b3 (redis#3112)

Version 5.1.0b2 (redis#3100)

Version 5.1.0b1 (redis#3093)

Version 5.1.0a1 (redis#3044)

Version 5.0.1 (redis#2958)

Updating all client licenses to clearly be MIT (redis#2884)