Fix github actions for python3 tests

Add a dummy test in test_sslsocket.py to workaround an issue in Python
3.12.

lib/py/test/test_sslsocket.py

@@ -348,6 +348,13 @@ def test_ssl_context(self):
         self._assert_connection_success(server, ssl_context=client_context)
 
 
+# Add a dummy test because starting from python 3.12, if all tests in a test
+# file are skipped that's considered an error.
+class TDummyTest(unittest.TestCase):
+    def test_dummy(self):
+        self.assertEqual(0, 0)
+
+
 if __name__ == '__main__':
     logging.basicConfig(level=logging.WARN)
     from thrift.transport.TSSLSocket import TSSLSocket, TSSLServerSocket, _match_has_ipaddress