bump go versions used in CI

[alexflint]

No description provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.19%. Comparing base (5ec29ce) to head (f02da4c).
Report is 19 commits behind head on master.

❗ Current head f02da4c differs from pull request most recent head 67353a8

Please upload reports for the commit 67353a8 to get more accurate results.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #232   +/-   ##
=======================================
  Coverage   99.19%   99.19%           
=======================================
  Files           5        5           
  Lines         745      745           
=======================================
  Hits          739      739           
  Misses          3        3           
  Partials        3        3           

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