build: Update scalafmt-core from 2.7.5 to 3.6.0

[cw-scala-steward]

Updates org.scalameta:scalafmt-core from 2.7.5 to 3.6.0.
GitHub Release Notes - Version Diff

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 = "scalafmt-core" } ]

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

dependencyOverrides = [{
  pullRequests = { frequency = "@monthly" },
  dependency = { groupId = "org.scalameta", artifactId = "scalafmt-core" }
}]

labels: library-update, early-semver-major, semver-spec-major, commit-count:1

[cw-scala-steward]

Superseded by #84.