Squashed 'subtrees/dagflow/' changes from daaef5c0..5ad52de7

5ad52de7 fix: fix numpy 1.23.1 as there is a conflict between numba and numpy 1.24

git-subtree-dir: subtrees/dagflow
git-subtree-split: 5ad52de74549564b9155ffe0f06419dc5fb891bb

requirements.txt

 contextlib2
 coverage
 numba
-numpy
+numpy==1.23.1
 pygraphviz
 pytest
 pytest-cov