Upgrade KafkaCat image used in KafkaSource e2e tests

[devguyio]

The 1.6.0 version includes built-in retrying.

Fixes #789

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: devguyio

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[codecov]

Codecov Report

Merging #790 (9a727b4) into main (ca4d18a) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #790   +/-   ##
=======================================
  Coverage   75.41%   75.41%           
=======================================
  Files         144      144           
  Lines        6497     6497           
=======================================
  Hits         4900     4900           
  Misses       1376     1376           
  Partials      221      221           

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[lionelvillard]

/lgtm

[devguyio]

/cherry-pick release-0.23

[knative-prow-robot]

@devguyio: new pull request created: #792

In response to this:

/cherry-pick release-0.23

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[devguyio]

/cherry-pick release-0.24

[knative-prow-robot]

@devguyio: new pull request created: #793

In response to this:

/cherry-pick release-0.24

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.