databases/py-redis: Update to 2.10.5

• Update PORTVERSION and distinfo checksum (2.10.5)
• Remove DOCS option, they dont build unless py-redis is installed [1]
• Add LICENSE_FILE
• Add TEST_DEPENDS and convert test target

Changes:

https://github.com/andymccurdy/redis-py/blob/2.10.5/CHANGES

PR: 204361 [1]
Reported by: olgeni [1]