chore: Update versions to allow work on 3.3.7

Author: tgodzik

project/Build.scala

@@ -88,7 +88,7 @@ object Build {
    *
    *  Warning: Change of this variable needs to be consulted with `expectedTastyVersion`
    */
-  val referenceVersion = "3.3.5"
+  val referenceVersion = "3.3.6-RC1"
 
   /** Version of the Scala compiler targeted in the current release cycle
    *  Contains a version without RC/SNAPSHOT/NIGHTLY specific suffixes
@@ -99,7 +99,7 @@ object Build {
    *
    *  Warning: Change of this variable might require updating `expectedTastyVersion`
    */
-  val developedVersion = "3.3.6"
+  val developedVersion = "3.3.7"
 
   /** The version of the compiler including the RC prefix.
    *  Defined as common base before calculating environment specific suffixes in `dottyVersion`