Update test_latest.yml to install numpy/scipy from wheels

This avoids issues with Python 3.12s deprecation of build tools used by numpy and scipy

.github/workflows/test_latest.yml

@@ -59,7 +59,8 @@ jobs:
       - name: Install dependencies
         run: |
           ${{ steps.python.outputs.python-path }} -m pip install --upgrade pip setuptools
-          ${{ steps.python.outputs.python-path }} -m pip install --pre pytest cython sympy pyparsing numpy jinja2 scipy sphinx
+          ${{ steps.python.outputs.python-path }} -m pip install -i https://pypi.anaconda.org/scientific-python-nightly-wheels/simple numpy scipy
+          ${{ steps.python.outputs.python-path }} -m pip install --pre pytest cython sympy pyparsing jinja2 sphinx
       - name: Install Brian2
         run: ${{ steps.python.outputs.python-path }} -m pip install .
       - name: Run Tests