Merge pull request playframework#1088 from scala-steward/update/play-3.1.0-M5

play, play-docs-sbt-plugin, ... 3.1.0-M6 (was 3.1.0-M4)

Author: mkurz

build.sbt

@@ -22,7 +22,7 @@ lazy val commonSettings = Seq(
   compile / javacOptions ++= Seq("--release", "17"),
   doc / javacOptions := Seq("-source", "17"),
   scalaVersion       := "2.13.18",
-  crossScalaVersions := Seq("2.13.18", "3.3.7"),
+  crossScalaVersions := Seq("2.13.18", "3.8.3"),
   scalacOptions ++= Seq("-deprecation", "-feature", "-unchecked", "-encoding", "utf8") ++
     (CrossVersion.partialVersion(scalaVersion.value) match {
       case Some((2, 13)) => Seq("-Xsource:3")

project/plugins.sbt

@@ -3,8 +3,8 @@ resolvers ++= Seq(
   Resolver.sonatypeCentralSnapshots, // used by deploy nightlies, which publish here & use -Dplay.version
 )
 
-addSbtPlugin("org.playframework" % "sbt-plugin"           % sys.props.getOrElse("play.version", "3.1.0-M4"))
-addSbtPlugin("org.playframework" % "play-docs-sbt-plugin" % sys.props.getOrElse("play.version", "3.1.0-M4"))
+addSbtPlugin("org.playframework" % "sbt-plugin"           % sys.props.getOrElse("play.version", "3.1.0-M6"))
+addSbtPlugin("org.playframework" % "play-docs-sbt-plugin" % sys.props.getOrElse("play.version", "3.1.0-M6"))
 
 addSbtPlugin("org.scalameta" % "sbt-scalafmt"    % "2.5.6")
 addSbtPlugin("com.typesafe"  % "sbt-mima-plugin" % "1.1.5")