Update scalafmt-core to 3.7.4 in series/0.23

[http4s-steward]

Updates org.scalameta:scalafmt-core from 3.7.3 to 3.7.4.
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 (3.7.3).
You might want to review and update them manually.

docs/changelog.md

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 = "30 days" },
  dependency = { groupId = "org.scalameta", artifactId = "scalafmt-core" }
}]

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