Merge pull request #171 from scala/update/scala-3.6.4

Set scalaVersion to 3.6.4 in README

Author: Philippus

README.md

@@ -35,7 +35,7 @@ You must use sbt 1.5.5 or newer; older versions of sbt are not supported.
 Set the Scala 3 version:
 
 ```scala
-scalaVersion := "3.6.2"
+scalaVersion := "3.6.4"
 ```
 
 ### Getting your project to compile with Scala 3