Update sbt-scalafmt to 2.5.6

[scala-steward]

About this PR

📦 Updates org.scalameta:sbt-scalafmt from 2.5.5 to 2.5.6

📜 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.

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⚙ Adjust future updates

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

updates.ignore = [ { groupId = "org.scalameta", artifactId = "sbt-scalafmt" } ]

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

dependencyOverrides = [{
  pullRequests = { frequency = "30 days" },
  dependency = { groupId = "org.scalameta", artifactId = "sbt-scalafmt" }
}]

^{labels: sbt-plugin-update, early-semver-patch, semver-spec-patch, commit-count:1}

[what-the-diff]

PR Summary

• Upgraded sbt-scalafmt plugin
  The version of the sbt-scalafmt plugin, a tool that helps improve the formatting of our code, has been updated from 2.5.5 to 2.5.6. This update will ensure we are using the latest, most optimized version of the tool, offering potential enhancements and bug fixes.