Update compilerplugin, scalapb-runtime to 0.11.20

Author: scala-steward-bot

project/plugins.sbt

@@ -20,7 +20,7 @@ addSbtPlugin("org.portable-scala" % "sbt-scala-native-crossproject" % "1.3.2")
 
 addSbtPlugin("com.thesamet" % "sbt-protoc" % "1.0.8")
 
-libraryDependencies += "com.thesamet.scalapb" %% "compilerplugin" % "0.11.19"
+libraryDependencies += "com.thesamet.scalapb" %% "compilerplugin" % "0.11.20"
 
 if (sys.env.isDefinedAt("GITHUB_ACTION")) {
   Def.settings(