Update librdkafka to 2.3.0

[mensfeld]

Lets give it some time as few times some bugs were reported right after the releases.

Plan:

• rdkafka-ruby specs pass
• waterdrop specs pass
• karafka specs pass

[samsm]

Hello!

Appreciate the caution, in my organization we were bitten by consumption issues in librdkafka 2.1.0.

Will offer though that Confluent is recommending 2.3.0 in reaction to this issue: OffsetForLeaderEpoch loop of failed requests with multiple leader changes

The symptom of this bug is that a consumer will stop reading a rebalanced partition, indefinitely, even if no other consumer picks it up.

[mensfeld]

@samsm hey. Thank you for your insights. karafka-rdkafka already got 2.3.0 approved (ref karafka#43) and all integrations in karafka pass with 2.3.0.

I will release 0.14 with 2.2.0 and will then release 0.15 with backport later.

[samsm]

Thanks! Appreciate it