Ruby 1.9: skip pg locking test for 1.9.1 also

activerecord/test/cases/locking_test.rb

@@ -283,7 +283,7 @@ def test_no_locks_no_wait
       end
 
       # Hit by ruby deadlock detection since connection checkout is mutexed.
-      if RUBY_VERSION < '1.9.2'
+      if RUBY_VERSION < '1.9.0'
         def test_second_lock_waits
           assert [0.2, 1, 5].any? { |zzz|
             first, second = duel(zzz) { Person.find 1, :lock => true }