Update scalafmt-core to 3.8.4

[scala-steward-asf]

About this PR

📦 Updates org.scalameta:scalafmt-core from 3.8.3 to 3.8.4

📜 GitHub Release Notes - Version Diff

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

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

^{labels: library-update, early-semver-patch, semver-spec-patch, commit-count:n:3}

[raboof]

Looks like since scalafmt 3.8.4, the AvoidInfix rule will also change postfixOps 5 seconds to 5.seconds

We can exclude that with rewrite.avoidInfix.excludePostfix = true in the scalafmt config.

'5 seconds' looks slightly nicer, but it's also a bit unusual. I'd be OK with writing 5.seconds from now on. WDYT?

[pjfanning]

We are also getting compile issues like

[error] /home/runner/work/pekko/pekko/testkit/src/main/scala/org/apache/pekko/testkit/CallingThreadDispatcher.scala:26:17: Unused import
[error] import language.postfixOps
[error]                 ^
[error] /home/runner/work/pekko/pekko/testkit/src/main/scala/org/apache/pekko/testkit/TestKit.scala:24:23: Unused import
[error] import scala.language.postfixOps
[error]                       ^
[error] two errors found

[He-Pin]

lgtm