assertDictContainsSubset was removed in Python 3.11


### Issue Summary

The deprecated unittest aliases were removed in python/cpython#28268 in Python 3.11

### Steps to Reproduce

```
twilio-python/tests/unit/jwt/test_jwt.py:        self.assertDictContainsSubset({
twilio-python/tests/unit/jwt/test_client_validation.py:        self.assertDictContainsSubset({
twilio-python/tests/unit/jwt/test_client_validation.py:        self.assertDictContainsSubset({
```


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