internal, log: remove code for old unsupported go-versions

[ucwong]

No description provided.

[codecov]

Codecov Report

Merging #1718 (afcf97e) into master (5c3fad1) will increase coverage by 0.01%.
Report is 2 commits behind head on master.
The diff coverage is 66.66%.

❗ Current head afcf97e differs from pull request most recent head 960174a. Consider uploading reports for the commit 960174a to get more accurate results

@@            Coverage Diff             @@
##           master    #1718      +/-   ##
==========================================
+ Coverage   52.77%   52.79%   +0.01%     
==========================================
  Files         484      483       -1     
  Lines       60657    60657              
==========================================
+ Hits        32012    32021       +9     
+ Misses      26205    26197       -8     
+ Partials     2440     2439       -1     

Files Changed	Coverage Δ
log/handler.go	24.82% <66.66%> (+1.80%)	⬆️

... and 12 files with indirect coverage changes