chore(deps): update golang docker tag to v1.20.4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
golang	docker	minor	1.15.3 -> 1.20.4

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[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +52.96 🎉

Comparison is base (3e39cb0) 0.00% compared to head (15ae587) 52.96%.

❗ Current head 15ae587 differs from pull request most recent head d84c83a. Consider uploading reports for the commit d84c83a to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #329       +/-   ##
===========================================
+ Coverage        0   52.96%   +52.96%     
===========================================
  Files           0      126      +126     
  Lines           0     6062     +6062     
===========================================
+ Hits            0     3211     +3211     
- Misses          0     2657     +2657     
- Partials        0      194      +194     

see 126 files with indirect coverage changes

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