Update sbt-scalafmt to 2.6.1 (#2968)

Author: scala-steward

project/plugins.sbt

@@ -12,7 +12,7 @@ addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "2.2.0")
 addSbtPlugin("com.github.sbt" % "sbt-java-formatter" % "0.11.0")
 addSbtPlugin("com.github.sbt.junit" % "sbt-jupiter-interface" % "0.19.0")
 addSbtPlugin("com.lightbend.sbt" % "sbt-bill-of-materials" % "1.0.2")
-addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.6.0")
+addSbtPlugin("org.scalameta" % "sbt-scalafmt" % "2.6.1")
 addSbtPlugin("ch.epfl.scala" % "sbt-scalafix" % "0.14.6")
 addSbtPlugin("com.github.sbt" % "sbt-osgi" % "0.10.0")
 addSbtPlugin("com.typesafe" % "sbt-mima-plugin" % "1.1.5")