python-josepy fails to build with Python 3.14.0a4.

_____________________ ERROR collecting tests/util_test.py ______________________
tests/util_test.py:9: in <module>
    import test_util
<frozen importlib._bootstrap>:1359: in _find_and_load
    ???
<frozen importlib._bootstrap>:1330: in _find_and_load_unlocked
    ???
<frozen importlib._bootstrap>:935: in _load_unlocked
    ???
/usr/lib/python3.14/site-packages/_pytest/assertion/rewrite.py:184: in exec_module
    exec(co, module.__dict__)
tests/test_util.py:13: in <module>
    import josepy.util
../BUILDROOT/usr/lib/python3.14/site-packages/josepy/__init__.py:71: in <module>
    from josepy.jws import JWS, Header, Signature
../BUILDROOT/usr/lib/python3.14/site-packages/josepy/jws.py:52: in <module>
    class Header(json_util.JSONObjectWithFields):
../BUILDROOT/usr/lib/python3.14/site-packages/josepy/json_util.py:236: in __new__
    raise ValueError(
E   ValueError: Field `alg` in JSONObject `Header` has no type annotation.
=========================== short test summary info ============================
ERROR tests/init_test.py - ValueError: Field `alg` in JSONObject `Header` has...
ERROR tests/json_util_test.py - ValueError: Field `alg` in JSONObject `Header...
ERROR tests/jwa_test.py - ValueError: Field `alg` in JSONObject `Header` has ...
ERROR tests/jwk_test.py - ValueError: Field `alg` in JSONObject `Header` has ...
ERROR tests/jws_test.py - ValueError: Field `alg` in JSONObject `Header` has ...
ERROR tests/test_util.py - ValueError: Field `alg` in JSONObject `Header` has...
ERROR tests/util_test.py - ValueError: Field `alg` in JSONObject `Header` has...
!!!!!!!!!!!!!!!!!!! Interrupted: 7 errors during collection !!!!!!!!!!!!!!!!!!!!
============================== 7 errors in 0.54s ===============================

https://docs.python.org/3.14/whatsnew/3.14.html

For the build logs, see:
https://copr-be.cloud.fedoraproject.org/results/@python/python3.14/fedora-rawhide-x86_64/08562434-python-josepy/

For all our attempts to build python-josepy with Python 3.14, see:
https://copr.fedorainfracloud.org/coprs/g/python/python3.14/package/python-josepy/

Testing and mass rebuild of packages is happening in copr.
You can follow these instructions to test locally in mock if your package builds with Python 3.14:
https://copr.fedorainfracloud.org/coprs/g/python/python3.14/

Let us know here if you have any questions.

Python 3.14 is planned to be included in Fedora 43.
To make that update smoother, we're building Fedora packages with all pre-releases of Python 3.14.
A build failure prevents us from testing all dependent packages (transitive [Build]Requires),
so if this package is required a lot, it's important for us to get it fixed soon.

We'd appreciate help from the people who know this package best,
but if you don't want to work on this now, let us know so we can try to work around it on our side.