Log Message:
py-msgpack: update to 1.0.4.

What's Changed

    Support Python 3.11 (beta)
    refresh ci settings. by @methane in #492
    Don't define _*ENDIAN macro on Unix. by @methane in #495
    Update setuptools and black by @methane in #498
    Use PyFloat_Pack8() on Python 3.11a7 by @vstinner in #499
    Upgrade black to fix CI by @hauntsaninja in #505
    Fix Unpacker max_buffer_length handling by @methane in #506
    ci: Update action versions. by @methane in #507
    Release v1.0.4 by @methane in #509