Revert "Bump tasty to 28.3-1"

Author: bishabosha

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

@@ -285,7 +285,7 @@ object TastyFormat {
    *  compatibility, but remains backwards compatible, with all
    *  preceeding `MinorVersion`.
    */
-  final val MinorVersion: Int = 3
+  final val MinorVersion: Int = 2
 
   /** Natural Number. The `ExperimentalVersion` allows for
    *  experimentation with changes to TASTy without committing