chore(deps): update dependency karafka-testing to v2.5.6

[mensfeld]

This PR contains the following updates:

Package	Change	Age	Confidence
karafka-testing (source, changelog)	2.5.5 → 2.5.6

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Release Notes

karafka/karafka-testing (karafka-testing)

v2.5.6

Compare Source

• [Feature] Support custom offset option in karafka.produce for test message production (#​230).
• [Feature] Restore ability to use implicit RSpec subject in consumer specs when described_class inherits from Karafka::BaseConsumer (#​110).

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