Update scalafmt-core to 3.0.6

[scala-steward]

Updates org.scalameta:scalafmt-core from 3.0.2 to 3.0.6.
GitHub Release Notes - Version Diff

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Files still referring to the old version number

The following files still refer to the old version number (3.0.2).
You might want to review and update them manually.

release-notes.md

Ignore 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" } ]

labels: library-update, semver-patch, old-version-remains