ci: Try to fix dependencies broken by NumPy 2 (#140)

* ci: try to fix dependencies broken by numpy 2

* use --no-build-isolation

* pre-install more dependencies

* more deps

.github/workflows/tests.yml

@@ -78,10 +78,15 @@ jobs:
       with:
         python-version: ${{ matrix.python-version }}
 
+    - name: Pre-install dependencies
+      run: |
+        pip install -vU pip
+        pip install -vU setuptools wheel Cython scipy 'numpy<2'  # for corrfunc, classy
+        pip install -vU --no-build-isolation corrfunc classy
+
     - name: Install package from source
       if: ${{ env.PUBLISH != 'true' }}
       run: |
-        pip install -U pip
         pip install -vU .[test]
         make -C pipe_asdf