update sbt 1.x to 1.12.10, make project compile against 2.0.0-RC12

[reynaldjoabet]

update sbt 1.x to 1.12.10, make project compile against 2.0.0-RC12:

• update build sbt: 1.11.4 -> 1.12.10
• update sbt 1.x cross-build version: 1.5.8 -> 1.12.10
• update sbt 2.x cross-build version: 2.0.0-RC3 -> 2.0.0-RC12
• migrate scoped keys to slash syntax (x in y -> y / x)
• replace deprecated scala.collection.JavaConverters with scala.jdk.CollectionConverters
• annotate openApiGenerate as @transient so sbt 2.x skips caching its Seq[File]
  output (no-op under sbt 1.x)
• reformat touched files (no behavioral change)

---

Summary by cubic

Upgrade the build to sbt 1.12.10 and enable cross-build on sbt 2.0.0-RC12. Migrate to slash syntax and remove deprecated APIs to keep behavior the same on 1.x and 2.x.

• Dependencies

  • Update root sbt.version: 1.11.4 → 1.12.10.
  • Update cross-build: pluginCrossBuild / sbtVersion 1.5.8 → 1.12.10 (Scala 2.12), 2.0.0-RC3 → 2.0.0-RC12 (others).

• Refactors

  • Migrate scoped keys to task / key (e.g., openApiGenerators / aggregate, openApiGenerate / version).
  • Replace scala.collection.JavaConverters with scala.jdk.CollectionConverters.
  • Annotate openApiGenerate with @transient to skip task output caching on sbt 2.x.

^{Written for commit d3d0e13. Summary will update on new commits. Review in cubic}

[cubic-dev-ai]

No issues found across 9 files

[wing328]

thank you. will include it in the next stable release.