Update sbt-scalafmt to 2.5.4 (#195)

Co-authored-by: scala-steward-asf[bot] <147768647+scala-steward-asf[bot]@users.noreply.github.com>

Author: scala-steward-asf[bot]

project/plugins.sbt

@@ -9,7 +9,7 @@
 
 addSbtPlugin("de.heikoseeberger" % "sbt-header" % "5.10.0")
 addSbtPlugin("com.github.sbt" % "sbt-pgp" % "2.3.1")
-addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.2")
+addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.5.4")
 addSbtPlugin("com.github.pjfanning" % "sbt-source-dist" % "0.1.12")
 addSbtPlugin("com.github.pjfanning" % "sbt-pekko-build" % "0.4.2")
 addSbtPlugin("com.github.sbt" % "sbt-dynver" % "5.1.0")