Description of problem:
Package python-google-api-core fails to build from source in Fedora Rawhide with tests.

Version-Release number of selected component (if applicable):
2.11.1-13.fc43

Steps to Reproduce:
Run a local mockbuild with the current state of dist-git

Reproducible: Always

Actual Results:
_____________ TestBackgroundConsumer.test_consumer_expected_error ______________
self = <tests.unit.test_bidi.TestBackgroundConsumer object at 0x7fffa4d67100>
caplog = <_pytest.logging.LogCaptureFixture object at 0x7fffa3e1ba10>
    def test_consumer_expected_error(self, caplog):
        caplog.set_level(logging.DEBUG)
    
        bidi_rpc = mock.create_autospec(bidi.BidiRpc, instance=True)
        bidi_rpc.is_active = True
        bidi_rpc.recv.side_effect = exceptions.ServiceUnavailable("Gone away")
    
        on_response = mock.Mock(spec=["__call__"])
    
        consumer = bidi.BackgroundConsumer(bidi_rpc, on_response)
    
        consumer.start()
    
        # Wait for the consumer's thread to exit.
        while consumer.is_active:
            pass
    
        on_response.assert_not_called()
        bidi_rpc.recv.assert_called_once()
>       assert "caught error" in caplog.text
E       AssertionError: assert 'caught error' in ''
E        +  where '' = <_pytest.logging.LogCaptureFixture object at 0x7fffa3e1ba10>.text
tests/unit/test_bidi.py:826: AssertionError
____________ TestBackgroundConsumer.test_consumer_unexpected_error _____________
self = <tests.unit.test_bidi.TestBackgroundConsumer object at 0x7fffa4eead50>
caplog = <_pytest.logging.LogCaptureFixture object at 0x7fffa3c511d0>
    def test_consumer_unexpected_error(self, caplog):
        caplog.set_level(logging.DEBUG)
    
        bidi_rpc = mock.create_autospec(bidi.BidiRpc, instance=True)
        bidi_rpc.is_active = True
        bidi_rpc.recv.side_effect = ValueError()
    
        on_response = mock.Mock(spec=["__call__"])
    
        consumer = bidi.BackgroundConsumer(bidi_rpc, on_response)
    
        consumer.start()
    
        # Wait for the consumer's thread to exit.
        while consumer.is_active:
            pass  # pragma: NO COVER (race condition)
    
        on_response.assert_not_called()
        bidi_rpc.recv.assert_called_once()
>       assert "caught unexpected exception" in caplog.text
E       AssertionError: assert 'caught unexpected exception' in ''
E        +  where '' = <_pytest.logging.LogCaptureFixture object at 0x7fffa3c511d0>.text
tests/unit/test_bidi.py:847: AssertionError
----------------------------- Captured stderr call -----------------------------
Thread-ConsumeBidirectionalStream caught unexpected exception  and will exit.
Traceback (most recent call last):
  File "/builddir/build/BUILD/python-google-api-core-2.11.1-build/BUILDROOT/usr/lib/python3.14/site-packages/google/api_core/bidi.py", line 655, in _thread_main
    response = self._bidi_rpc.recv()
  File "/usr/lib64/python3.14/unittest/mock.py", line 1175, in __call__
    return self._mock_call(*args, **kwargs)
           ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.14/unittest/mock.py", line 1179, in _mock_call
    return self._execute_mock_call(*args, **kwargs)
           ~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.14/unittest/mock.py", line 1234, in _execute_mock_call
    raise effect
ValueError