chore: drop custom +~ version switching

as this feature is in sbt since sbt/sbt#6894
and sbt/sbt#6936

.github/workflows/nightly-1.0-builds.yml

@@ -108,7 +108,7 @@ jobs:
         # No need to specify the full Scala version. Only the Scala
         # binary version is required and Pekko build will set the right
         # full version from it.
-        scalaVersion: ["2.12", "2.13", "3.3"]
+        scalaVersion: ["2.12.x", "2.13.x", "3.3.x"]
         javaVersion: [8, 11, 17, 21]
     steps:
       - name: Checkout
@@ -142,4 +142,4 @@ jobs:
             -Dpekko.actor.testkit.typed.timefactor=2 \
             -Dpekko.test.tags.exclude=gh-exclude,timing \
             -Dpekko.test.multi-in-test=false \
-            clean "+~ ${{ matrix.scalaVersion }} test" checkTestsHaveRun
+            clean "++ ${{ matrix.scalaVersion }} test" checkTestsHaveRun

.github/workflows/nightly-builds.yml

@@ -116,7 +116,7 @@ jobs:
         # No need to specify the full Scala version. Only the Scala
         # binary version is required and Pekko build will set the right
         # full version from it.
-        scalaVersion: ["2.12", "2.13", "3.3"]
+        scalaVersion: ["2.12.x", "2.13.x", "3.3.x"]
         javaVersion: [8, 11, 17, 21]
     env:
       DEVELOCITY_ACCESS_KEY: ${{ secrets.GE_ACCESS_TOKEN }}
@@ -152,7 +152,7 @@ jobs:
             -Dpekko.actor.testkit.typed.timefactor=2 \
             -Dpekko.test.tags.exclude=gh-exclude,timing \
             -Dpekko.test.multi-in-test=false \
-            clean "+~ ${{ matrix.scalaVersion }} test" checkTestsHaveRun
+            clean "++ ${{ matrix.scalaVersion }} test" checkTestsHaveRun
 
 # comment out test report until an apache or GitHub published action (action-surefire-report) can be found or added allowlist from INFRA
 #      - name: Test Reports

.github/workflows/scala3-build.yml

@@ -66,7 +66,7 @@ jobs:
           -Dmultinode.Xms256M \
           -Dmultinode.Xmx256M \
           -Dmultinode.XX:+AlwaysActAsServerClassMachine \
-          "+~ 3 ${{ matrix.command }}"
+          "++ 3.x ${{ matrix.command }}"
 
       # comment out email actions until we have an email address to use (and we need to get INFRA to whitelist dawidd6/action-send-mail)
       #- name: Email on failure

.github/workflows/scala3-compile.yml

@@ -54,4 +54,4 @@ jobs:
           DEVELOCITY_ACCESS_KEY: ${{ secrets.GE_ACCESS_TOKEN }}
         run: |
           sbt \
-          "+~ 3 ${{ matrix.command }}"
+          "++ 3.x ${{ matrix.command }}"

project/PekkoBuild.scala

@@ -39,7 +39,6 @@ object PekkoBuild {
   val parallelExecutionByDefault = false // TODO: enable this once we're sure it does not break things
 
   lazy val rootSettings = Def.settings(
-    commands += switchVersion,
     UnidocRoot.pekkoSettings,
     Protobuf.settings,
     GlobalScope / parallelExecution := System
@@ -346,30 +345,4 @@ object PekkoBuild {
   }
 
   def majorMinor(version: String): Option[String] = """\d+\.\d+""".r.findFirstIn(version)
-
-  // So we can `sbt "+~ 3 clean compile"`
-  //
-  // The advantage over `++` is twofold:
-  // * `++` also requires the patch version, `+~` finds the first supported Scala version that matches the prefix (if any)
-  // * When subprojects need to be excluded, ++ needs to be specified for each command
-  //
-  // So the `++` equivalent of the above example is `sbt "++ 3.1.2 clean" "++ 3.1.2 compile"`
-  val switchVersion: Command = Command.args("+~", "<version> <args>") { (initialState: State, args: Seq[String]) =>
-    {
-      val requestedVersionPrefix = args.head
-      val requestedVersion = Dependencies.allScalaVersions.filter(_.startsWith(requestedVersionPrefix)).head
-
-      def run(state: State, command: String): State = {
-        val parsed = s"++ $requestedVersion $command".foldLeft(Cross.switchVersion.parser(state))((p, i) => p.derive(i))
-        parsed.resultEmpty match {
-          case e: sbt.internal.util.complete.Parser.Failure =>
-            throw new IllegalStateException(e.errors.mkString(", "))
-          case sbt.internal.util.complete.Parser.Value(v) =>
-            v()
-        }
-      }
-      val commands = args.tail
-      commands.foldLeft(initialState)(run)
-    }
-  }
 }