Description of problem:
Package python-fastapi fails to build from source in Fedora Rawhide.

Version-Release number of selected component (if applicable):
0.136.3-3.fc45

Steps to Reproduce:
koji build --scratch f45 python-fastapi-0.136.3-3.fc45.src.rpm

Additional info:
This package is tracked by Koschei. See:
https://koschei.fedoraproject.org/package/python-fastapi

Reproducible: Always

Actual Results:
___________________ ERROR collecting tests/test_ws_router.py ___________________
/usr/lib/python3.14/site-packages/starlette/testclient.py:43: in <module>
    import httpx2 as httpx
E   ModuleNotFoundError: No module named 'httpx2'
During handling of the above exception, another exception occurred:
tests/test_ws_router.py:14: in <module>
    from fastapi.testclient import TestClient
fastapi/testclient.py:1: in <module>
    from starlette.testclient import TestClient as TestClient  # noqa
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
/usr/lib/python3.14/site-packages/starlette/testclient.py:54: in <module>
    warnings.warn(
E   starlette.exceptions.StarletteDeprecationWarning: Using `httpx` with `starlette.testclient` is deprecated; install `httpx2` instead.