Update Gobusybox

[hugelgupf]

• Use new golang.Default API
• Always pass golang.Environ as a pointer
• Use Environ.Lookup API to ensure build tags are passed even in binary build mode.

[codecov]

Codecov Report

Patch coverage: 75.00% and project coverage change: +0.15% 🎉

Comparison is base (8031498) 75.38% compared to head (4afdd23) 75.53%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2735      +/-   ##
==========================================
+ Coverage   75.38%   75.53%   +0.15%     
==========================================
  Files         416      416              
  Lines       42380    42373       -7     
==========================================
+ Hits        31949    32008      +59     
+ Misses      10431    10365      -66     

Files Changed	Coverage Δ
pkg/vmtest/integration.go	66.03% <0.00%> (+1.22%)	⬆️
pkg/uroot/builder/gbb.go	52.63% <50.00%> (-0.15%)	⬇️
pkg/uroot/builder/binary.go	83.33% <75.00%> (-4.17%)	⬇️
pkg/uroot/uroot.go	63.63% <100.00%> (ø)
pkg/vmtest/gotest.go	78.22% <100.00%> (-0.35%)	⬇️

... and 6 files with indirect coverage changes

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