Rename logger.attempt*.bracket back to label

[fthomas]

No description provided.

[codecov]

Codecov Report

Merging #2256 (b73bac7) into master (2f7b9cf) will increase coverage by 0.03%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master    #2256      +/-   ##
==========================================
+ Coverage   77.93%   77.96%   +0.03%     
==========================================
  Files         135      135              
  Lines        2284     2283       -1     
  Branches       58       58              
==========================================
  Hits         1780     1780              
+ Misses        504      503       -1     

Impacted Files	Coverage Δ
...org/scalasteward/core/application/StewardAlg.scala	44.11% <0.00%> (ø)
...ala/org/scalasteward/core/nurture/NurtureAlg.scala	0.00% <0.00%> (ø)
...main/scala/org/scalasteward/core/util/logger.scala	100.00% <100.00%> (ø)

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