regenerate expired hardcoded certs

[maschmid]

Unit tests are now failing because of the expired hardoced test certs

Proposed Changes

• 🧹 Update hardcoded unit test certificates

[knative-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: maschmid
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[codecov]

Codecov Report

❌ Patch coverage is 0% with 58 lines in your changes missing coverage. Please review.
✅ Project coverage is 51.03%. Comparing base (c6be563) to head (9a6e613).

Files with missing lines	Patch %	Lines
...entingtls/eventingtlstesting/eventingtlstesting.go	0.00%	58 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8986      +/-   ##
==========================================
+ Coverage   51.02%   51.03%   +0.01%     
==========================================
  Files         409      409              
  Lines       22001    22001              
==========================================
+ Hits        11225    11228       +3     
+ Misses       9914     9910       -4     
- Partials      862      863       +1     

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[maschmid]

closing, as #9009 is obviously better :)