Tweak scalafmt conf

Author: alexarchambault

.scalafmt.conf

@@ -35,3 +35,11 @@ project.excludeFilters = [
   ".metals"
   "out"
 ]
+fileOverride {
+  "glob:**/manual/client/src/**" {
+     runner.dialect = scala3
+  }
+  "glob:**/manual/server/src/**" {
+     runner.dialect = scala3
+  }
+}