Update sbt-java-formatter to 0.13.1 (#261)

Author: scala-steward

project/plugins.sbt

@@ -1,3 +1,3 @@
 addSbtPlugin("com.github.sbt" % "sbt-github-actions" % "0.31.0")
 addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.12.0")
-addSbtPlugin("com.github.sbt" % "sbt-java-formatter" % "0.12.0")
+addSbtPlugin("com.github.sbt" % "sbt-java-formatter" % "0.13.1")