Drop testing on k8s v1.26

[ReToCode]

Changes

• Drop testing on k8s v1.26

Fixes #588

/assign @dprotaso
/assign @nak3

[knative-prow]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (f9e2ce4) 73.08% compared to head (1742248) 73.08%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #589   +/-   ##
=======================================
  Coverage   73.08%   73.08%           
=======================================
  Files           9        9           
  Lines         691      691           
=======================================
  Hits          505      505           
  Misses        157      157           
  Partials       29       29           

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[nak3]

/lgtm