only use updated initialize arguments in SQLServerRealTransaction for…

… rails 6.1

lib/active_record/connection_adapters/sqlserver/transaction.rb

@@ -31,10 +31,18 @@ def current_isolation_level
     module SQLServerRealTransaction
       attr_reader :starting_isolation_level
 
-      def initialize(connection, **args)
-        @connection = connection
-        @starting_isolation_level = current_isolation_level if args[:isolation]
-        super
+      if Rails::VERSION::MAJOR >= 6 && Rails::VERSION::MINOR >= 1
+        def initialize(connection, **args)
+          @connection = connection
+          @starting_isolation_level = current_isolation_level if args[:isolation]
+          super
+        end
+      else
+        def initialize(connection, options, **args)
+          @connection = connection
+          @starting_isolation_level = current_isolation_level if options[:isolation]
+          super
+        end
       end
 
       def commit