Fix GOPROXY for forks

[ciarams87]

Fix GOPROXY for forks

Tested here: #3855

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.96%. Comparing base (f98f6ec) to head (d1c0b81).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3854      +/-   ##
==========================================
- Coverage   87.00%   86.96%   -0.04%     
==========================================
  Files         128      128              
  Lines       16434    16434              
  Branches       62       62              
==========================================
- Hits        14298    14292       -6     
- Misses       1959     1964       +5     
- Partials      177      178       +1     

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