Fix incorrect `actions/checkout` version comment in Go test workflow

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 35.03%. Comparing base (46ec9c2) to head (76f739a). Report is 49 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #133 +/- ## ========================================== - Coverage 35.80% 35.03% -0.77% ========================================== Files 16 33 +17 Lines 1363 2777 +1414 ========================================== + Hits 488 973 +485 - Misses 801 1696 +895 - Partials 74 108 +34 ```

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