chore(deps): update dependency redis to '~> 5.2.0'

This MR contains the following updates:

Package	Update	Change
redis (changelog)	minor	'~> 5.1.0' -> '~> 5.2.0'

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Release Notes

redis/redis-rb (redis)

v5.2.0

Compare Source

• 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.

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