Update sbt-assembly to 2.3.1

Author: scala-steward-asf[bot]

project/plugins.sbt

@@ -7,7 +7,7 @@
  * This file is part of the Apache Pekko project, which was derived from Akka.
  */
 
-addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "2.2.0")
+addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "2.3.1")
 
 addSbtPlugin("com.lightbend.sbt" % "sbt-java-formatter" % "0.7.0")
 addSbtPlugin("com.lightbend.sbt" % "sbt-bill-of-materials" % "1.0.2")