fix: ensure venv uses correct Python version from matrix

- Explicitly specify Python version when creating venv with uv
- Prevents mismatch between build Python (e.g., 3.10) and test Python
- Fixes: _diskannpy.cpython-310-x86_64-linux-gnu.so in Python 3.11 error

The issue: uv venv was defaulting to Python 3.11 regardless of matrix version

.github/workflows/build-reusable.yml

@@ -206,8 +206,8 @@ jobs:
 
       - name: Install built packages for testing
         run: |
-          # Create a virtual environment
-          uv venv
+          # Create a virtual environment with the correct Python version
+          uv venv --python python${{ matrix.python }}
           source .venv/bin/activate || source .venv/Scripts/activate
 
           # Install the built wheels directly to ensure we use locally built packages