bugfix: Add new matroska MIME types

[EdwardBetts]

The mime types audio/x-matroska and video/x-matroska have been deprecated and replaced with audio/matroska video/matroska. This change fixes a test failure on Debian sid.

See https://salsa.debian.org/debian/media-types/-/commit/0e6a959c8ac22b0516f620467a57d3968097a323

[EdwardBetts]

Fixes this test failure.

============================= test session starts ==============================
platform linux -- Python 3.13.2, pytest-8.3.5, pluggy-1.5.0
rootdir: /home/edward/src/2025/vendor/python-rokuecp
configfile: pyproject.toml
plugins: cov-5.0.0, requests_mock-1.12.1, anyio-4.8.0, aresponses-3.0.0, asyncio-0.25.1, mock-3.14.0, syrupy-4.8.1, time-machine-2.16.0, pytest_freezer-0.4.9, xvfb-3.0.0, xdist-3.6.1, tornasync-0.6.0.post2, hypothesis-6.127.4, typeguard-4.4.2, Faker-33.3.1, kgb-7.2, respx-0.22.0
asyncio: mode=Mode.AUTO, asyncio_default_fixture_loop_scope=None
collected 74 items

tests/test_client.py ..............                                      [ 18%]
tests/test_helpers.py .F....                                             [ 27%]
tests/test_interface.py .................................                [ 71%]
tests/test_models.py .....................                               [100%]

=================================== FAILURES ===================================
___________________________ test_guess_stream_format ___________________________

    def test_guess_stream_format() -> None:
        """Test the guess_stream_format helper."""
        assert guess_stream_format("/path/media.media") is None
        assert guess_stream_format("/path/media.txt") is None
    
        assert guess_stream_format("/path/media.mp4", "video/mp4") == "mp4"
        assert guess_stream_format("/path/media.mp4") == "mp4"
        assert guess_stream_format("/path/media.m4v") == "mp4"
        assert guess_stream_format("/path/media.mov") == "mp4"
>       assert guess_stream_format("/path/media.mkv") == "mkv"
E       AssertionError: assert None == 'mkv'
E        +  where None = guess_stream_format('/path/media.mkv')

tests/test_helpers.py:41: AssertionError
=========================== short test summary info ============================
FAILED tests/test_helpers.py::test_guess_stream_format - AssertionError: asse...
========================= 1 failed, 73 passed in 1.36s =========================

[cdce8p]

Hi @ctalkington 👋🏻 Could you do a new release with this change? It will also be required for compatibility with Python 3.14. See python/cpython#126412. Would be awesome to have a fix available early.

[ctalkington]

https://pypi.org/project/rokuecp/0.19.5/