Unblocks:

• support scala-native Scala 3 build #868

See also discussion in:

• Cross publish native scalameta/munit#477 (comment)
• support scala-native Scala 3 build #868 (comment)
• Migrate build to sbt-typelevel cats#4143 (comment)
• Migrate to sbt-typelevel #875 (comment)

scalacheck is definitely in more of a maintenance-mode so anyone who truly wants to stick fast to 3.0 can pin to Scalacheck 1.15.4 without missing out on much. We can merge outstanding PRs and do a last hurrah 1.15.5 on 3.0 before bumping.