Update sbt-assembly to 2.1.5 (#816)

* Update sbt-assembly to 2.1.5

* Revert commit(s) c0ed70d

* Update sbt-assembly to 2.1.5

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

Author: scala-steward-asf[bot]

Diff for: 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" % "2.1.4")
+addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "2.1.5")
 
 addSbtPlugin("com.lightbend.sbt" % "sbt-java-formatter" % "0.7.0")
 addSbtPlugin("com.lightbend.sbt" % "sbt-bill-of-materials" % "1.0.2")