Update workflow.yml

Author: PGelss

.github/workflows/workflow.yml

@@ -37,6 +37,7 @@ jobs:
         flake8 . --count --exit-zero --max-complexity=10 --max-line-length=127 --statistics
     - name: Code testing and coverage
       run: |
+        pip install numpy==1.26
         python -c "import numpy; print(numpy.__version__)"
         pip install pytest
         pip install pytest-cov