Fix CentOS Stream 9 wheel test: allow PyPI access for numpy dependency

The --no-index flag prevented pip from fetching the numpy dependency
from PyPI. Using --find-links alone lets pip find netgraph-core from
the local wheelhouse while resolving numpy from PyPI.

Co-authored-by: Andrey G <networmix@gmail.com>

Author: cursoragent

.github/workflows/release.yml

@@ -79,7 +79,7 @@ jobs:
       - name: Install and test wheel
         run: |
           python3.11 -m pip install --upgrade pip
-          python3.11 -m pip install netgraph-core --no-index --find-links wheelhouse/
+          python3.11 -m pip install netgraph-core --find-links wheelhouse/
           python3.11 -c "import netgraph_core; print('CentOS Stream 9:', netgraph_core.__version__)"
 
   publish_pypi: