Add k8s 1.26 to nightly run as k8s_latest is 1.27

[vepatel]

Proposed changes

• Add k8s 1.26 to nightly test runs.

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

[codecov]

Codecov Report

Merging #3788 (e18f988) into main (a8507c4) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #3788      +/-   ##
==========================================
+ Coverage   52.36%   52.38%   +0.02%     
==========================================
  Files          59       59              
  Lines       16890    16890              
==========================================
+ Hits         8844     8848       +4     
+ Misses       7749     7747       -2     
+ Partials      297      295       -2     

see 1 file with indirect coverage changes

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