[BUG]: Test test_cross_module_exception_translator fails

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Problem description

_________________________________________________________________________ test_cross_module_exception_translator ___________________________________________________________________________

    @pytest.mark.xfail(
        "env.PYPY and env.MACOS",
        raises=RuntimeError,
        reason="Expected failure with PyPy and libc++ (Issue #2847 & PR #2999)",
    )
    def test_cross_module_exception_translator():
        with pytest.raises(KeyError):
            # translator registered in cross_module_tests
>           m.throw_should_be_translated_to_key_error()
E           RuntimeError

../../pybind11-2.8.1/tests/test_exceptions.py:82: RuntimeError
================================================================================== short test summary info ==================================================================================

Tests run from the port's 'test' target.

Version: 2.8.1
OS: FreeBSD 13

Reproducible example code

No response

Start with tests/test_exceptions.py and the test_cross_module_exception_translator failure, then inspect the cross_module_tests entry point and reproduce it through the port's test target on FreeBSD 13. Compare the reported pybind11 2.8.1 behavior with the expected KeyError and existing platform-specific xfail; done means the reported configuration is handled with the regression test passing.