Replace unittest assertEquals with assertEqual since it was deprecate…

…d in python 3.12

ci/L0_backend_vllm/enabled_stream/enabled_stream_test.py

@@ -72,7 +72,7 @@ async def request_iterator():
                 result, error = response
                 if expect_error:
                     self.assertIsInstance(error, InferenceServerException)
-                    self.assertEquals(
+                    self.assertEqual(
                         error.message(),
                         "Error generating stream: When streaming, `exclude_input_in_output` = False is not allowed.",
                         error,