Drop unused sbt-revolver plugin and scalapb compilerplugin dep

- sbt-revolver was never referenced (no reStart/reStop/Revolver usage)
- scalapb compilerplugin is only needed for Scala protobuf codegen; we only
  use PB.gens.java(...)

Author: jupblb

project/plugins.sbt

@@ -8,15 +8,11 @@ addSbtPlugin("com.thesamet" % "sbt-protoc" % "1.0.6")
 addSbtPlugin("com.lightbend.sbt" % "sbt-java-formatter" % "0.6.1")
 addSbtPlugin("pl.project13.scala" % "sbt-jmh" % "0.4.3")
 addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.15.0")
-addSbtPlugin("io.spray" % "sbt-revolver" % "0.9.1")
 addSbtPlugin("org.jetbrains.scala" % "sbt-kotlin-plugin" % "3.1.6")
 addSbtPlugin("com.github.sbt.junit" % "sbt-jupiter-interface" % "0.15.1")
 // sbt-jdi-tools appears to fix an error related to this message:
 // [error] (plugin / Compile / compileIncremental) java.lang.NoClassDefFoundError: com/sun/tools/javac/code/Symbol
 addSbtPlugin("org.scala-debugger" % "sbt-jdi-tools" % "1.1.1")
 
-libraryDependencies ++=
-  List("com.thesamet.scalapb" %% "compilerplugin" % "0.11.11")
-
 ThisBuild / libraryDependencySchemes ++=
   Seq("org.scala-lang.modules" %% "scala-xml" % VersionScheme.Always)