test: use numpy 1.18 for real in minimal versions tests

diff --git a/tests/constraints.txt b/tests/constraints.txt
index b90d9742af576380fa6f8f5e3c3e4b8b5148b2ac..22fe8337d336306b8e22dea3d16b3538cd6f6128 100644 (file)
--- a/tests/constraints.txt
+++ b/tests/constraints.txt
@@ -38,6 +38,6 @@ tomli == 2.0.1
 # Undeclared extras to "unblock" extra features
 
 shapely == 1.7.0
-# Warning: binary package only available up to python < 3.9.
+# Warning: binary package only available up to python <= 3.8.
 # Bump to a higher version when min supported python version increases past it.
-numpy == 1.20.0
+numpy == 1.18.0