Relaxed version requirements on Cython upgrade (#90)

.github/workflows/build.yml

@@ -15,10 +15,10 @@ jobs:
     - uses: actions/checkout@v4
     - uses: actions/setup-python@v4
       with:
-        python-version: '3.11.x'
+        python-version: '3.9.x'
     - name: Setup Python
       run: |
-        python3 -m pip install Cython numpy scipy matplotlib nose-py3
+        python3 -m pip install Cython numpy scipy==1.12.0 matplotlib nose-py3 setuptools==69.1.0
     - name: Install system
       run: |
         sudo apt-get -y install cmake liblapack-dev libsuitesparse-dev libhypre-dev

setup.cfg

@@ -1,13 +1,13 @@
 [options]
 setup_requires =
     setuptools
-    numpy >= 1.26.3
+    numpy >= 1.19.5
     cython >= 3.0.7
 
 install_requires =
-    python >= 3.11
-    numpy >= 1.26.3
-    scipy >= 1.11.4
+    python >= 3.9
+    numpy >= 1.19.5
+    scipy >= 1.10.1, < 1.13.0
     cython >= 3.0.7
     nose-py3 >= 1.6.3
     matplotlib > 3