[release-0.23] 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

[devguyio]

/lgtm
/approve

[lionelvillard]

/lgtm

[lionelvillard]

/approve

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-0.23@a5e581a). Click here to learn what that means.
The diff coverage is n/a.

@@               Coverage Diff               @@
##             release-0.23     #792   +/-   ##
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  Coverage                ?   72.67%           
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  Files                   ?      140           
  Lines                   ?     5860           
  Branches                ?        0           
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  Hits                    ?     4259           
  Misses                  ?     1374           
  Partials                ?      227           

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