Release Scala 3.8.0

Signed-off-by: Wojciech Mazur <wmazur@virtuslab.com>

Author: WojciechMazur

project/Build.scala

@@ -80,7 +80,7 @@ object Build {
    *  During release candidate cycle incremented by the release officer before publishing a subsequent RC version;
    *  During final, stable release is set exactly to `developedVersion`.
   */
-  val baseVersion = s"$developedVersion-RC6"
+  val baseVersion = developedVersion
 
   /** The version of TASTY that should be emitted, checked in runtime test
    *  For defails on how TASTY version should be set see related discussions:
@@ -98,7 +98,7 @@ object Build {
    *      - in release candidate branch is experimental if {patch == 0}
    *      - in stable release is always non-experimetnal
    */
-  val expectedTastyVersion = "28.8-experimental-1"
+  val expectedTastyVersion = "28.8"
   checkReleasedTastyVersion()
 
   /** Final version of Scala compiler, controlled by environment variables. */

tasty/src/dotty/tools/tasty/TastyFormat.scala

@@ -341,7 +341,7 @@ object TastyFormat {
    *  is able to read final TASTy documents if the file's
    *  `MinorVersion` is strictly less than the current value.
    */
-  final val ExperimentalVersion: Int = 1
+  final val ExperimentalVersion: Int = 0
 
   /**This method implements a binary relation (`<:<`) between two TASTy versions.
    *