fix(ci): fix linter issues and use deterministic golangci-lint version used both locally and in CI

[pmalek]

Use a deterministic version of golangci-lint that is the same locally and on CI.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 16.66667% with 5 lines in your changes missing coverage. Please review.

Project coverage is 59.85%. Comparing base (77f320b) to head (4fc6b25).

Files	Patch %	Lines
kong/custom_entity_service.go	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #464      +/-   ##
==========================================
+ Coverage   59.79%   59.85%   +0.05%     
==========================================
  Files          71       71              
  Lines        4455     4449       -6     
==========================================
- Hits         2664     2663       -1     
+ Misses       1172     1167       -5     
  Partials      619      619              

Flag	Coverage Δ
2.1	36.27% <16.66%> (+0.02%)	⬆️
2.2	48.68% <16.66%> (+0.04%)	⬆️
2.3	49.31% <16.66%> (+0.04%)	⬆️
2.4	49.35% <16.66%> (+0.04%)	⬆️
2.5	49.35% <16.66%> (+0.04%)	⬆️
2.6	49.35% <16.66%> (+0.04%)	⬆️
2.7	51.04% <16.66%> (+0.04%)	⬆️
2.8	51.04% <16.66%> (+0.04%)	⬆️
3.0	55.18% <16.66%> (+0.05%)	⬆️
3.1	56.79% <16.66%> (+0.05%)	⬆️
3.2	56.79% <16.66%> (+0.05%)	⬆️
3.3	56.79% <16.66%> (+0.05%)	⬆️
3.4	59.15% <16.66%> (+0.05%)	⬆️
3.5	56.97% <16.66%> (+0.05%)	⬆️
3.6	56.97% <16.66%> (+0.05%)	⬆️
community	44.05% <16.66%> (+0.03%)	⬆️
enterprise	58.28% <16.66%> (+0.05%)	⬆️
integration	59.85% <16.66%> (+0.05%)	⬆️

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[randmonkey]

One step before me 💯