Fix type

Author: andyw8

lib/ruby_lsp/ruby_lsp_rails/definition.rb

@@ -83,9 +83,9 @@ def handle_callback(node)
         end
       end
 
-      sig { params(node: T.untyped).void }
+      sig { params(node: Prism::CallNode).void }
       def handle_route(node)
-        result = @client.route_location(node.message)
+        result = @client.route_location(T.must(node.message))
         return unless result
 
         file_path, line = result.fetch(:location).split(":")