sbt-eclipse 6.1.0

Noteworthy

Implement JDT compiler settings writing by @spangaer in https://github.com/sbt/sbt-eclipse/pull/407
Also test with Java 21 and 17 by @mkurz in https://github.com/sbt/sbt-eclipse/pull/422

Update scalatest to 3.2.14 by @scala-steward in https://github.com/sbt/sbt-eclipse/pull/406
Update sbt to 1.7.2 by @scala-steward in https://github.com/sbt/sbt-eclipse/pull/405
Update sbt-ci-release to 1.5.11 by @scala-steward in https://github.com/sbt/sbt-eclipse/pull/408
Update sbt to 1.7.3 by @scala-steward in https://github.com/sbt/sbt-eclipse/pull/409
Update sbt to 1.8.0 by @scala-steward in https://github.com/sbt/sbt-eclipse/pull/410
Update scalaz-core, scalaz-effect to 7.2.35 by @scala-steward in https://github.com/sbt/sbt-eclipse/pull/411
Update sbt to 1.8.2 by @scala-steward in https://github.com/sbt/sbt-eclipse/pull/413
Update scalatest to 3.2.15 by @scala-steward in https://github.com/sbt/sbt-eclipse/pull/414
Update sbt-ci-release to 1.5.12 by @scala-steward in https://github.com/sbt/sbt-eclipse/pull/415
Upgrade versions of workflows by @mkurz in https://github.com/sbt/sbt-eclipse/pull/416
Update scalatest to 3.2.17 by @scala-steward in https://github.com/sbt/sbt-eclipse/pull/420
Update scala-library to 2.12.18 by @scala-steward in https://github.com/sbt/sbt-eclipse/pull/419
Update sbt to 1.9.7 by @scala-steward in https://github.com/sbt/sbt-eclipse/pull/417

@spangaer made their first contribution in https://github.com/sbt/sbt-eclipse/pull/407

Full Changelog: https://github.com/sbt/sbt-eclipse/compare/6.0.0...6.1.0