Bump redis from 5.0.7 to 5.0.8

Bumps redis from 5.0.7 to 5.0.8.

Changelog

Sourced from redis's changelog.

5.0.8

• Fix Redis#without_reconnect for sentinel clients. Fix #1212.
• Add sentinel_username, sentinel_password for sentinel clients. Bump redis-client to >=0.17.0. See #1213

Commits

• 2b183ad Release 5.0.8
• 230a5c4 Merge pull request #1227 from supercaracal/add-sharded-pubsub-support
• 54e6a7e Add sharded Pub/Sub support for cluster
• ccdf15f Merge pull request #1226 from supercaracal/support-transaction-for-cluster-cl...
• dda95f8 Support transactions for cluster client
• c888c74 Merge pull request #1225 from afinzel/master
• ad0f30b Update default timeout docs
• 8e9183a Update sentinel auth with explicit kwargs (#1221)
• 01de51a Merge pull request #1222 from supercaracal/fix-cluster
• ea4d04a Fix redis-clustering gem to pass the test with latest dependencies
• Additional commits viewable in compare view

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