Fixing python 3.9 installation issue

Author: cokelaer

pyproject.toml

@@ -49,7 +49,7 @@ matplotlib = [
 ]
 numpy = [
     {version = "^2", python ="^3.9"},
-    {version = "<2,", python ="<3.9"}
+    {version = "<2,", python ="<=3.9"}
 ]
 importlib_resources = [
     {version = ">6", python=">=3.9,<=3.10"}