[release-0.24] Upgrade KafkaCat image used in KafkaSource e2e tests

[knative-prow-robot]

This is an automated cherry-pick of #790

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[devguyio]

@googlebot I consent

[lionelvillard]

/lgtm
/approve

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: knative-prow-robot, lionelvillard

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-0.24@9cfa1ed). Click here to learn what that means.
The diff coverage is n/a.

@@               Coverage Diff               @@
##             release-0.24     #793   +/-   ##
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  Coverage                ?   75.56%           
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  Files                   ?      141           
  Lines                   ?     6336           
  Branches                ?        0           
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  Hits                    ?     4788           
  Misses                  ?     1322           
  Partials                ?      226           

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[matzew]

/test pull-knative-sandbox-eventing-kafka-unit-tests