Update sbt-assembly to 2.3.1

Author: scala-steward

project/plugins.sbt

@@ -1,5 +1,5 @@
 addSbtPlugin("com.github.sbt" % "sbt-github-actions" % "0.25.0")
-addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "2.3.0")
+addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "2.3.1")
 addSbtPlugin("com.eed3si9n" % "sbt-buildinfo" % "0.11.0")
 addSbtPlugin("com.github.sbt" % "sbt-unidoc" % "0.5.0")
 addSbtPlugin("com.github.sbt" % "sbt-ci-release" % "1.5.12")