sbt 2.0 cross-builds

[BillyAutrey]

Because sbt-ci-release pulls in plugins via addSbtPlugin, as far as I can tell it forces this plugin to require crossbuilds of the downstream plugins as well.

This means we'll need 2.0.0-M2 crossbuilds of:

• sbt-dynver
  • Crossbuild to sbt 2.0.0 + Scala 3 sbt-dynver#308
  • wip in add sbt 2.x build setting sbt-dynver#305
• sbt-git
  • Crossbuild to sbt 2.0.0 + Scala 3 sbt-git#257
  • Available in 2.1.0
• sbt-sonatype
  • Crossbuild to sbt 2.0.0 + Scala 3 xerial/sbt-sonatype#523
  • Available in 3.12.0
• sbt-pgp - ✅
  • Cross build to sbt 2.x sbt-pgp#214 - 2.3.0
  • Update sbt-pgp to 2.3.0 #312

[xuwei-k]

• Update sbt-sonatype to 3.12.2 #320 (comment) 🤔

[eed3si9n]

@xuwei-k The current version works but in the future it might not support JDK 8? If that happens, I suggest we should fork the plugin to maintain JDK 8 compatibility.