Merge pull request typelevel#1233 from Kazark/munit

Add doobie-munit package to integrate Doobie with the shiny new MUnit

Merge pull request typelevel#1428 from jatcwang/1.x_scala3_rc3

[1.x] Scala 3 RC3, drop RC1

Merge pull request typelevel#1427 from jatcwang/scala3_rc3

[0.13.x] Cross build for Scala 3 RC3. Drop RC1