workflows: build-numpy: use proxy URL for indexing

Signed-off-by: Trevor Gamblin <tgamblin@baylibre.com>

Author: threexc

.github/workflows/build-numpy.yml

@@ -23,7 +23,7 @@ permissions:
 env:
   # `inputs.version` is empty on pull_request events; default to 2.5.0 there.
   NUMPY_VERSION: ${{ inputs.version || '2.5.0' }}
-  UV_EXTRA_INDEX_URL: https://gitlab.com/api/v4/projects/riseproject%2Fpython%2Fwheel_builder/packages/pypi/simple
+  UV_EXTRA_INDEX_URL: https://pypi.riseproject.dev/simple/
   UV_INDEX_STRATEGY: unsafe-best-match
   UV_ONLY_BINARY: ':all:'