Update redis requirement from ~> 4 to ~> 5

[dependabot]

Updates the requirements on redis to permit the latest version.

Changelog

Sourced from redis's changelog.

5.3.0

• Fix the return type of hgetall when used inside a multi transaction which is itself inside a pipeline.

5.2.0

• Now require Ruby 2.6 because redis-client does.
• Eagerly close subscribed connection when using subscribe_with_timeout. See #1259.
• Add exception flag in pipelined allowing failed commands to be returned in the result array when set to false.

5.1.0

• multi now accept a watch keyword argument like redis-client. See #1236.
• bitcount and bitpos now accept a scale: argument on Redis 7+. See #1242
• Added expiretime and pexpiretime. See #1248.

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

5.0.7

• Fix compatibility with redis-client 0.15.0 when using Redis Sentinel. Fix #1209.

5.0.6

• Wait for an extra config.read_timeout in blocking commands rather than an arbitrary 100ms. See #1175.
• Treat ReadOnlyError as ConnectionError. See #1168.

5.0.5

• Fix automatic disconnection when the process was forked. See #1157.

5.0.4

• Cast ttl argument to integer in expire, setex and a few others.

5.0.3

• Add OutOfMemoryError as a subclass of CommandError

5.0.2

• Fix Redis#close to properly reset the fork protection check.

5.0.1

• Added a fake Redis::Connections.drivers method to be compatible with older sidekiq versions.

... (truncated)

Commits

• a1d6f68 Release 5.3.0
• 18642ef Merge pull request #1287 from junyuanz1/junyuanz/fix-uninitialized-constant-e...
• 579263c Fix uninitialized constant Redis::Error error
• 433ec69 Merge pull request #1281 from jjb/patch-1
• 6a8d165 Merge pull request #1283 from supercaracal/fix-cluster-client-delay-loading-f...
• 8611b68 Fix a memoization bug for cluster client
• 3a14135 note default timeout in readme
• 13f3246 Merge pull request #1278 from supercaracal/fix-a-test-case-for-cluster
• 52cae8a Fix several test cases for the cluster client
• 15c8c92 Merge pull request #1275 from supercaracal/fix-cluster-test
• Additional commits viewable in compare view

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