Update scala-library to 2.12.21

[xerial-bot]

About this PR

📦 Updates org.scala-lang:scala-library from 2.12.20 to 2.12.21

📜 GitHub Release Notes - Version Diff

Usage

✅ Please merge!

I'll automatically update this PR to resolve conflicts as long as you don't change it yourself.

If you'd like to skip this version, you can just close this PR. If you have any feedback, just mention me in the comments below.

Configure Scala Steward for your repository with a .scala-steward.conf file.

Have a fantastic day writing Scala!

🔍 Files still referring to the old version number

The following files still refer to the old version number (2.12.20).
You might want to review and update them manually.

sbt

⚙ Adjust future updates

Add this to your .scala-steward.conf file to ignore future updates of this dependency:

updates.ignore = [ { groupId = "org.scala-lang", artifactId = "scala-library" } ]

Or, add this to slow down future updates of this dependency:

dependencyOverrides = [{
  pullRequests = { frequency = "30 days" },
  dependency = { groupId = "org.scala-lang", artifactId = "scala-library" }
}]

^{labels: library-update, early-semver-patch, semver-spec-patch, old-version-remains, commit-count:1}

[gemini-code-assist]

Summary of Changes

Hello @xerial-bot, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request automates the update of the project's Scala library to version 2.12.21. This ensures the project benefits from the latest bug fixes and minor improvements available in the Scala 2.12 series, maintaining compatibility and stability.

Highlights

• Scala Library Update: The org.scala-lang:scala-library dependency has been updated from version 2.12.20 to 2.12.21.

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[gemini-code-assist]

Code Review

This pull request updates scala-library from version 2.12.20 to 2.12.21. The changes correctly update the version in build.sbt and a test build file. I've included one suggestion to improve maintainability by removing a hardcoded Scala version in the test configuration, which would make future updates easier. Overall, the update is a good patch bump.

[gemini-code-assist]

To avoid hardcoding the Scala version and improve maintainability, consider reading it from a system property. This would allow you to set the version in your main build.sbt's scriptedLaunchOpts and have it propagate to your scripted tests automatically, ensuring consistency. For this to work, you would need to add a property like "-Dscala.version.2.12=" + SCALA_2 to scriptedLaunchOpts in the root build.sbt.

  scalaVersion               := sys.props.get("scala.version.2.12").getOrElse("2.12.21"),