Declare Redis >= 5.0 dependency

[pedropb]

Since b403d0c, Redis >= 5 has been a dependency for ci-queue. This commit declares this dependency on the gemspec file.

Relates to #156 .

---

We ran into this issue while troubleshooting a failed dependabot bump on ci-queue. The transitive dependency on redis resolved to version 4.8.1 in our app, which satisfied all gems except ci-queue.

[ChrisBr]

Makes sense! Waiting for @casperisfine final approval who is on holiday atm.

[ChrisBr]

Alternatively we could do something like to not enforce the Redis version.

if ::Redis::VERSION < "5.0.0"
  @redis = ::Redis.new(
    url: redis_url,
    # Booting a CI worker is costly, so in case of a Redis blip,
    # it makes sense to retry for a while before giving up.
    reconnect_attempts: [0, 0, 0.1, 0.5, 1, 3, 5],
  )
else
  @redis = ::Redis.new(url: redis_url)
end

[ChrisBr]

Fixed in #248

[ChrisBr]

I released v0.41.0. Let me know if that works.

Thanks for reporting ❤️

[pedropb]

Upgrading straight to 0.41.0 worked for us @ChrisBr . Thanks for the swift response!