Address issues reported by golangci-lint after bumping the version to v1.64.5

[henrybear327]

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

Resolving CI issues in #19466 (See this CI run for more detail)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.89%. Comparing base (2de17bd) to head (43df62f).
Report is 5 commits behind head on main.

Additional details and impacted files

see 23 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #19475      +/-   ##
==========================================
+ Coverage   68.84%   68.89%   +0.04%     
==========================================
  Files         420      420              
  Lines       35762    35762              
==========================================
+ Hits        24622    24638      +16     
+ Misses       9714     9699      -15     
+ Partials     1426     1425       -1     

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[ivanvc]

/retest

[ivanvc]

LGTM on green. Thanks, @henrybear327.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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