Remove SCL conditions from specfile

[r0x0d]

Since we are building with a new buildroot that contains go 1.21, we don't require the scl workarounds anymore. We can just use plain golang in the BuildRequires and the normal make build.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 65.90%. Comparing base (201200e) to head (972a453).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #143   +/-   ##
=======================================
  Coverage   65.90%   65.90%           
=======================================
  Files           5        5           
  Lines         264      264           
=======================================
  Hits          174      174           
  Misses         68       68           
  Partials       22       22           

Flag	Coverage Δ
go-1.20	65.90% <ø> (ø)
go-1.21	65.90% <ø> (ø)

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