remove 1.12.x from build config for consistency with master

[dmitris]

per @johanbrandhorst's request #336 (comment)

[johanbrandhorst]

Flaky logging test again

[codecov-commenter]

Codecov Report

Merging #337 into v2 will decrease coverage by 6.09%.
The diff coverage is 69.23%.

@@            Coverage Diff             @@
##               v2     #337      +/-   ##
==========================================
- Coverage   83.58%   77.48%   -6.10%     
==========================================
  Files          30       30              
  Lines         932      924       -8     
==========================================
- Hits          779      716      -63     
- Misses        114      163      +49     
- Partials       39       45       +6     

Impacted Files	Coverage Δ
chain.go	0.00% <ø> (-90.91%)	⬇️
interceptors/tags/fieldextractor.go	84.84% <ø> (-0.45%)	⬇️
interceptors/logging/payload.go	83.07% <50.00%> (+0.46%)	⬆️
interceptors/retry/retry.go	69.66% <72.72%> (-6.59%)	⬇️
wrappers.go	66.66% <0.00%> (-33.34%)	⬇️
interceptors/retry/options.go	73.17% <0.00%> (-7.32%)	⬇️

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[johanbrandhorst]

Thanks for your contribution!