chore(tox): Use unsafe-best-match to fetch pre-release wheels

Author: effigies

tox.ini

@@ -60,7 +60,8 @@ deps =
 extras = tests
 setenv =
   pre: PIP_EXTRA_INDEX_URL=https://pypi.anaconda.org/scientific-python-nightly-wheels/simple
-  pre: UV_EXTRA_INDEX_URL=https://pypi.anaconda.org/scientific-python-nightly-wheels/simple
+  pre: UV_INDEX=https://pypi.anaconda.org/scientific-python-nightly-wheels/simple
+  pre: UV_INDEX_STRATEGY=unsafe-best-match
   FSLOUTPUTTYPE=NIFTI_GZ
 uv_resolution =
   min: lowest-direct