Remove unused vertx-kafka-client from dependencies

[pierDipi]

As per title

[pierDipi]

/cc @matzew @creydr

[creydr]

/lgtm

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: creydr, pierDipi

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[pierDipi]

/test upgrade-tests

[pierDipi]

   wait.go:200: test-zixonxhy/kafka-sink-xkznaluv condition is {"type":"Ready","status":"False","lastTransitionTime":"2024-05-07T11:01:44Z","reason":"Topic is not present or invalid","message":"topics [topic-levysyej]: invalid topic topic-levysyej"}

[pierDipi]

/retest-required

[pierDipi]

/retest

[matzew]

/test upgrade-tests

[pierDipi]

/test upgrade-tests

[pierDipi]

/test upgrade-tests

[pierDipi]

/test reconciler-tests-namespaced-broker

[knative-prow]

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

Test name	Commit	Details	Required	Rerun command
reconciler-tests-namespaced-broker_eventing-kafka-broker_main	e8265dd	link	true	/test reconciler-tests-namespaced-broker

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