Update dependency redis to v4.8.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
redis (changelog)	4.7.1 → 4.8.1

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Release Notes

redis/redis-rb (redis)

v4.8.1

Compare Source

• Automatically reconnect after fork regardless of reconnect_attempts

v4.8.0

Compare Source

• Introduce sadd? and srem? as boolean returning versions of sadd and srem.
• Deprecate sadd and srem returning a boolean when called with a single argument.
  To enable the redis 5.0 behavior you can set Redis.sadd_returns_boolean = false.
• Deprecate passing timeout as a positional argument in blocking commands (brpop, blop, etc).

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[cr-gpt]

Seems you are using me but didn't get OPENAI_API_KEY seted in Variables/Secrets for this repo. you could follow readme for more information