Tests fail on Python 3.14b1

[JelleZijlstra]

Running tests on a build of 3.14 beta 1 (plus some upcoming changes), I get the following test failures:

FAILED tests/test_subparser.py::TestSubparser::test_add_subparser_twice - ValueError: conflicting subparser: a
FAILED tests/test_subparser.py::TestSubparser::test_add_subparsers_twice - ValueError: cannot have multiple subparser arguments
FAILED tests/test_to_tap_class.py::test_subclasser_complex_help_message[function] - AssertionError: assert 'usage: pytes...sage and exit' == 'usage: pytes...sage and exit'
FAILED tests/test_to_tap_class.py::test_subclasser_complex_help_message[Class] - AssertionError: assert 'usage: pytes...sage and exit' == 'usage: pytes...sage and exit'
FAILED tests/test_to_tap_class.py::test_subclasser_complex_help_message[_Args] - AssertionError: assert 'usage: pytes...sage and exit' == 'usage: pytes...sage and exit'
FAILED tests/test_to_tap_class.py::test_subclasser_complex_help_message[class_or_function_3] - AssertionError: assert 'usage: pytes...sage and exit' == 'usage: pytes...sage and exit'
FAILED tests/test_utils.py::TypeToStrTests::test_type_to_str - AssertionError: 'List[int] | Dict[float, bool]' != 'Union[List[int], Dict[float, bool]]'

Most appear to be due to https://docs.python.org/3.14/whatsnew/3.14.html#whatsnew314-typing-union, where now repr(Union[int, str]) == "int | str", but the first two look like some argparse change; I haven't investigated further.

I might send a patch for the Union issue later but no guarantee.

[kddubey]

ty for raising @JelleZijlstra

@martinjm97 / @swansonk14 mind taking a look at #164? no rush ofc :-)