[chore] Remove deadcode dotty.tools.dotc.config.ScalaRelease (#24579)

Author: hamzaremmal

compiler/src/dotty/tools/dotc/config/ScalaRelease.scala

@@ -20,9 +20,6 @@ object ScalaSettingsProperties:
     val maxVersion = Math.min(jdkVersion, maxTargetVersion)
     (minReleaseVersion to maxVersion).toList.map(_.toString)
 
-  def supportedScalaReleaseVersions: List[String] =
-    ScalaRelease.values.toList.map(_.show)
-
   def supportedSourceVersions: List[String] =
     SourceVersion.values.diff(SourceVersion.illegalInSettings)
       .map(_.toString).toList

compiler/src/dotty/tools/dotc/config/ScalaSettingsProperties.scala

@@ -15,7 +15,6 @@ import ast.TreeTypeMap
 import NameKinds.*
 import dotty.tools.dotc.ast.tpd
 import dotty.tools.dotc.ast.untpd
-import dotty.tools.dotc.config.ScalaRelease.*
 
 import dotty.tools.dotc.core.Annotations.*
 import dotty.tools.dotc.core.StdNames.*

compiler/src/dotty/tools/dotc/transform/PickleQuotes.scala

@@ -20,7 +20,6 @@ import dotty.tools.dotc.core.Annotations.*
 import dotty.tools.dotc.core.Names.*
 import dotty.tools.dotc.core.StdNames.*
 import dotty.tools.dotc.quoted.*
-import dotty.tools.dotc.config.ScalaRelease.*
 import dotty.tools.dotc.staging.StagingLevel.*
 import dotty.tools.dotc.staging.QuoteTypeTags
 import dotty.tools.dotc.staging.QuoteTypeTags.*

compiler/src/dotty/tools/dotc/transform/Splicing.scala

@@ -6,7 +6,7 @@ import core.*
 import Annotations.Annotation
 import Symbols.*, Types.*, Contexts.*, Flags.*, Decorators.*, reporting.*
 import util.SrcPos
-import config.{ScalaVersion, NoScalaVersion, Feature, ScalaRelease}
+import config.{ScalaVersion, NoScalaVersion, Feature}
 import MegaPhase.MiniPhase
 import scala.util.{Failure, Success}
 import ast.tpd