Update golangci-lint and fix complains

[Jakob3xD]

Description

• Update golangci-lint
• fix linting complains

Issues Resolved

List any issues this PR will resolve, e.g. Closes [...].

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.33%. Comparing base (06a6dc8) to head (c97c0ba).
⚠️ Report is 116 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #740      +/-   ##
==========================================
+ Coverage   57.29%   60.33%   +3.03%     
==========================================
  Files         315      377      +62     
  Lines        9823    11694    +1871     
==========================================
+ Hits         5628     7055    +1427     
- Misses       2902     3204     +302     
- Partials     1293     1435     +142     

Flag	Coverage Δ
integration	52.84% <100.00%> (+2.00%)	⬆️
unit	14.92% <ø> (+2.07%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
internal/test/helper.go	65.97% <100.00%> (ø)
opensearchapi/api_aliases.go	100.00% <ø> (ø)
opensearchapi/api_bulk.go	100.00% <ø> (ø)
opensearchapi/api_cat-aliases.go	100.00% <ø> (ø)
opensearchapi/api_cat-allocation.go	100.00% <ø> (ø)
opensearchapi/api_cat-cluster_manager.go	100.00% <ø> (ø)
opensearchapi/api_cat-count.go	100.00% <ø> (ø)
opensearchapi/api_cat-fielddata.go	100.00% <ø> (ø)
opensearchapi/api_cat-health.go	100.00% <ø> (ø)
opensearchapi/api_cat-indices.go	100.00% <ø> (ø)
... and 173 more

... and 53 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[Jakob3xD]

@VijayanB do you have time reviewing this?
Doing the review commit by commit should be easier to read.