3.4.2 & 3.5.0-RC1 Release procedure

[Kordyjan]

Switch development from 3.4.1 to 3.4.2

• Create branch release-3.5.0 from main

Publish 3.4.2 artifacts to Maven Central via CI:

• On release-3.4.2 branch:
  • In Build.scala: Set baseVersion to 3.4.2
  • In changelogs add file with a changelog
• Tag the branch as 3.4.2
• Build

Publish 3.5.0-RC1 artifacts to Maven Central via CI:

• On release-3.5.0 branch
  • In Build.scala: Set referenceVersion to 3.4.2
  • In changelogs add file with a changelog
• Tag the branch as 3.5.0-RC1
• Build
• Build

Set bootstrapping for future versions version on main:

• In Build.scala: Set referenceVersion to 3.5.0-RC1:
• Check and update project/MiMaFilters.scala

Confirm that the tooling is working correctly:

• Metals:
  • 3.4.2
  • 3.5.0-RC1
• Scala Native:
  • 3.4.2
  • 3.5.0-RC1
• Scastie:
  • 3.4.2
  • 3.5.0-RC1
• Scala DAP:
  • 3.4.2
  • 3.5.0-RC1
• Scala CLI:
  • 3.4.2
  • 3.5.0-RC1

Update the ecosystem:

• Release 3.4.2 to SDKMAN
• Update the templates and examples projects:
  • scala3-mill-example-project:
    • Update Scala to 3.4.2 scala3-mill-example-project#24
  • scala3-cross.g8:
    • Update Scala to 3.4.2 scala3-cross.g8#105
  • scala3-staging.g8:
    • Update Scala to 3.4.2 scala3-staging.g8#47
  • scala3-tasty-inspector.g8:
    • Update Scala to 3.4.2 scala3-tasty-inspector.g8#42
  • scala3.g8:
    • Update Scala to 3.4.2 scala3.g8#143

Prepare the documentation:

• Merge release-3.4.2 into language-reference-stable
• Publish API docs for 3.4.2
• Add 3.4.2 to the version list in API docs
• Update docs.scala-lang:
  • Add api link to 3.4.2 docs.scala-lang#3022

Announce the releases:

• Make both GitHub releases public:
  • 3.4.2
  • 3.5.0-RC1
• Publish an announcement on https://scala-lang.org:
  • Add 3.4.2 announcement scala-lang#1652
• Open the 3.5.0 tracking thread on https://contributors.scala-lang.org:
  • https://contributors.scala-lang.org/t/3-5-0-release-thread/6666
• Unlock Scala Steward updates:
  • Unlock Scala 3.4.2 scala-steward-org/scala-steward#3358