Update scalafmt-core to 3.0.4

[scala-steward]

Updates org.scalameta:scalafmt-core from 2.7.5 to 3.0.4. 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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Files still referring to the old version number

The following files still refer to the old version number (2.7.5). You might want to review and update them manually. ``` .github/workflows/format.yml ```

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-major, old-version-remains

[coveralls]

Coverage decreased (-2.8%) to 91.975% when pulling 0af5ab37ea2334a43ee1b98f777aa960c31b6e30 on scala-steward:update/scalafmt-core-3.0.4 into ca10c64b98af9973d1b830d6a180d8b2c8898d98 on iheartradio:master.

[coveralls]

Coverage decreased (-0.5%) to 94.304% when pulling 0af5ab37ea2334a43ee1b98f777aa960c31b6e30 on scala-steward:update/scalafmt-core-3.0.4 into ca10c64b98af9973d1b830d6a180d8b2c8898d98 on iheartradio:master.

[scala-steward]

Superseded by #171.