bump min k8s version to v1.31

[dprotaso]

/assign @skonto

Release Note

Kubernetes min version is now v1.31

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.80%. Comparing base (4994b59) to head (c4c1555).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15774      +/-   ##
==========================================
- Coverage   80.83%   80.80%   -0.03%     
==========================================
  Files         222      222              
  Lines       18075    18075              
==========================================
- Hits        14611    14606       -5     
- Misses       3094     3098       +4     
- Partials      370      371       +1     

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[skonto]

/lgtm
/approve

[knative-prow]

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