ci: update golangci-lint configuration

[reugn]

• Update golangci-lint-action version to v1.63.4
• Add reassign linter
• Address linter warnings

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 96.15385% with 2 lines in your changes missing coverage. Please review.

Project coverage is 94.56%. Comparing base (49e33c3) to head (44760d2).

Files with missing lines	Patch %	Lines
quartz/cron.go	97.72%	1 Missing ⚠️
quartz/util.go	87.50%	0 Missing and 1 partial ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #155      +/-   ##
==========================================
- Coverage   94.60%   94.56%   -0.05%     
==========================================
  Files          20       20              
  Lines        1243     1233      -10     
==========================================
- Hits         1176     1166      -10     
  Misses         49       49              
  Partials       18       18              

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