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

fixes spesmilo#7307

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

see
python/cpython@60ce8f0
see https://bugs.python.org/issue36384

Backported from Electrum v4.1.3.

electrum_nmc/electrum/tests/test_util.py

@@ -138,7 +138,7 @@ def test_list_enabled_bits(self):
 
     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"))