Update scalacheck to 1.15.0

[scala-steward]

Updates org.scalacheck:scalacheck from 1.14.3 to 1.15.0.
GitHub Release Notes - Changelog - Version Diff

I'll automatically update this PR to resolve conflicts as long as you don't change it yourself.

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Ignore future updates

Add this to your .scala-steward.conf file to ignore future updates of this dependency:

updates.ignore = [ { groupId = "org.scalacheck", artifactId = "scalacheck" } ]

labels: library-update, semver-minor

[codecov-io]

Codecov Report

Merging #267 into master will increase coverage by 0.18%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #267      +/-   ##
==========================================
+ Coverage   96.11%   96.29%   +0.18%     
==========================================
  Files          25       25              
  Lines         540      540              
  Branches        9        9              
==========================================
+ Hits          519      520       +1     
+ Misses         21       20       -1     

Impacted Files	Coverage Δ
regex/src/main/scala/combinator.scala	92.98% <0.00%> (+1.75%)	⬆️

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