Upgrade to Go 1.21 and enable the loopvar GOEXPERIMENT

[FollowTheProcess]

Description

Motivation and Context

Closes #

How Has This Been Tested?

Checklist

• I have updated the documentation if needed.
• I have updated the tests if needed.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (7db0a37) 90.66% compared to head (cdc1cfc) 90.66%.
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #108   +/-   ##
=======================================
  Coverage   90.66%   90.66%           
=======================================
  Files          13       13           
  Lines        1511     1511           
=======================================
  Hits         1370     1370           
  Misses        100      100           
  Partials       41       41           

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