Merge pull request #49 from hmrc/BDOG-3112

BDOG-3112 Build for Scala 3 and drop Scala 2.12

build.sbt

@@ -1,8 +1,7 @@
 import sbt.Keys._
-import scala.collection.JavaConverters._
 
-val scala2_12 = "2.12.18"
 val scala2_13 = "2.13.12"
+val scala3    = "3.3.3"
 
 ThisBuild / majorVersion := 7
 ThisBuild / isPublicArtefact := true
@@ -25,7 +24,6 @@ lazy val library = (project in file("."))
 
 // empty artefact, exists to ensure eviction of previous play-language jar which has now moved into play-language-play-28
 lazy val playLanguage = Project("play-language", file("play-language"))
-  .settings(crossScalaVersions := Seq(scala2_12, scala2_13))
 
 def copySources(module: Project) = Seq(
   Compile / scalaSource := (module / Compile / scalaSource).value,
@@ -41,7 +39,6 @@ lazy val playLanguagePlay28 = Project("play-language-play-28", file("play-langua
   .disablePlugins(JUnitXmlReportPlugin) //Required to prevent https://github.com/scalatest/scalatest/issues/1427
   .settings(copySources(playLanguagePlay30))
   .settings(
-    crossScalaVersions := Seq(scala2_12, scala2_13),
     libraryDependencies ++= AppDependencies.play28
   )
   .settings(
@@ -60,7 +57,6 @@ lazy val playLanguagePlay29 = Project("play-language-play-29", file("play-langua
   .disablePlugins(JUnitXmlReportPlugin) //Required to prevent https://github.com/scalatest/scalatest/issues/1427
   .settings(copySources(playLanguagePlay30))
   .settings(
-    crossScalaVersions := Seq(scala2_13),
     libraryDependencies ++= AppDependencies.play29
   )
   .settings(
@@ -77,7 +73,7 @@ lazy val playLanguagePlay30 = Project("play-language-play-30", file("play-langua
   .enablePlugins(SbtTwirl)
   .disablePlugins(JUnitXmlReportPlugin) //Required to prevent https://github.com/scalatest/scalatest/issues/1427
   .settings(
-    crossScalaVersions := Seq(scala2_13),
+    crossScalaVersions := Seq(scala2_13, scala3),
     libraryDependencies ++= AppDependencies.play30
   )
   .settings(

project/AppDependencies.scala

@@ -31,9 +31,9 @@ object AppDependencies {
 
   private def playVersion(playSuffix: String) =
     playSuffix match {
-      case "play-28" => "2.8.20"
-      case "play-29" => "2.9.0"
-      case "play-30" => "3.0.0"
+      case "play-28" => "2.8.21"
+      case "play-29" => "2.9.3"
+      case "play-30" => "3.0.3"
     }
 
   private def playOrg(playSuffix: String): String =
@@ -46,8 +46,8 @@ object AppDependencies {
   private def scalaTestPlusPlayVersion(playSuffix: String): String =
     playSuffix match {
       case "play-28" => "5.1.0"
-      case "play-29" => "6.0.0"
-      case "play-30" => "7.0.0"
+      case "play-29" => "6.0.1"
+      case "play-30" => "7.0.1"
     }
 
   private def flexmarkAllVersion(playSuffix: String): String =

project/build.properties

@@ -1 +1 @@
-sbt.version=1.9.7
+sbt.version=1.9.9

project/plugins.sbt

@@ -3,7 +3,7 @@ resolvers += Resolver.url("HMRC-open-artefacts-ivy2", url("https://open.artefact
   Resolver.ivyStylePatterns
 )
 
-addSbtPlugin("uk.gov.hmrc"       % "sbt-auto-build"             % "3.15.0")
+addSbtPlugin("uk.gov.hmrc"       % "sbt-auto-build"             % "3.22.0")
 addSbtPlugin("org.scalameta"     % "sbt-scalafmt"               % "2.4.0")
 
 sys.env.get("PLAY_VERSION") match {