Update lint in ci, some lint fixes

[FZambia]

Up golang ci stack to the latest version.

[codecov]

Codecov Report

❌ Patch coverage is 81.81818% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.86%. Comparing base (df043a0) to head (5188919).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
redis_shard.go	75.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #520      +/-   ##
==========================================
- Coverage   85.04%   84.86%   -0.19%     
==========================================
  Files          42       42              
  Lines        7943     7947       +4     
==========================================
- Hits         6755     6744      -11     
- Misses        806      817      +11     
- Partials      382      386       +4     

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