Test failure on Python 3.12

[fabaff]

Tests work Python 3.11 but not on Python 3.12.

============================= test session starts ==============================
platform linux -- Python 3.12.3, pytest-8.1.1, pluggy-1.4.0
rootdir: /build/source
collected 84 items                                                             

tests/test_aiosasl.py .....FFF......F.....FFFF.............F....FF.F.... [ 59%]
F....F....                                                               [ 71%]
tests/test_channel_binding_methods.py .........                          [ 82%]
tests/test_stringprep.py ..............                                  [ 98%]
tests/test_unicode_version.py .                                          [100%]

=================================== FAILURES ===================================
_______________ TestSASLStateMachine.test_reject_double_initiate _______________

self = <test_aiosasl.TestSASLStateMachine testMethod=test_reject_double_initiate>

    def test_reject_double_initiate(self):
        run_coroutine(self.sm.initiate("foo", b"bar"))
    
>       with self.assertRaisesRegexp(RuntimeError,
                                     "has already been called"):
E                                    AttributeError: 'TestSASLStateMachine' object has no attribute 'assertRaisesRegexp'. Did you mean: 'assertRaisesRegex'?

tests/test_aiosasl.py:184: AttributeError
_________ TestSASLStateMachine.test_reject_double_initiate_after_error _________

self = <test_aiosasl.TestSASLStateMachine testMethod=test_reject_double_initiate_after_error>

    def test_reject_double_initiate_after_error(self):
        opaque_error = object()
        self.intf.initiate.side_effect = aiosasl.SASLFailure(
            opaque_error
[...]
'assertRaisesRegexp'. D...
FAILED tests/test_aiosasl.py::TestSCRAM::test_reject_protocol_violation_2 - AttributeError: 'TestSCRAM' object has no attribute 'assertRaisesRegexp'. D...
FAILED tests/test_aiosasl.py::TestSCRAM::test_too_low_iteration_count - AttributeError: 'TestSCRAM' object has no attribute 'assertRaisesRegexp'. D...
FAILED tests/test_aiosasl.py::TestSCRAMPLUS::test_incorrect_nonce - AttributeError: 'TestSCRAMPLUS' object has no attribute 'assertRaisesRegexp...
FAILED tests/test_aiosasl.py::TestSCRAMPLUS::test_reject_protocol_violation - AttributeError: 'TestSCRAMPLUS' object has no attribute 'assertRaisesRegexp...
=================== 14 failed, 70 passed, 1 warning in 0.41s ===================