fix tests: adapt to breaking change of ipaddress.ip_address in py3.9.5

fixes https://github.com/spesmilo/electrum/issues/7307

We can simply remove that test as we don't actually care whether the
leading zeroes are allowed.

see https://github.com/python/cpython/commit/60ce8f0be6354ad565393ab449d8de5d713f35bc
see https://bugs.python.org/issue36384

electrum/tests/test_util.py

@@ -231,7 +231,7 @@ class TestUtil(ElectrumTestCase):
 
     def test_is_ip_address(self):
         self.assertTrue(is_ip_address("127.0.0.1"))
-        self.assertTrue(is_ip_address("127.000.000.1"))
+        #self.assertTrue(is_ip_address("127.000.000.1"))  # disabled as result differs based on python version
         self.assertTrue(is_ip_address("255.255.255.255"))
         self.assertFalse(is_ip_address("255.255.256.255"))
         self.assertFalse(is_ip_address("123.456.789.000"))