[WIP] Upgrade Kafka clients to 3.9.0

[pierDipi]

From 3.7.1 to 3.9.0

[knative-prow]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.50%. Comparing base (2cde7b9) to head (1d9079f).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4203      +/-   ##
==========================================
+ Coverage   45.49%   45.50%   +0.01%     
==========================================
  Files         270      270              
  Lines       19873    19873              
==========================================
+ Hits         9041     9044       +3     
+ Misses      10113    10111       -2     
+ Partials      719      718       -1     

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[knative-prow]

@pierDipi: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
unit-tests_eventing-kafka-broker_main	1d9079f	link	true	/test unit-tests
channel-reconciler-tests-ssl_eventing-kafka-broker_main	1d9079f	link	true	/test channel-reconciler-tests-ssl
integration-tests_eventing-kafka-broker_main	1d9079f	link	true	/test integration-tests
upgrade-tests_eventing-kafka-broker_main	1d9079f	link	true	/test upgrade-tests
reconciler-tests_eventing-kafka-broker_main	1d9079f	link	true	/test reconciler-tests

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[knative-prow-robot]

PR needs rebase.

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