fix: compatibility with NumPy 1.26

pyproject.toml

@@ -23,7 +23,7 @@ python = "^3.8"
 skyfield = "^1.21"
 numpy = [
     { version = "<1.25", python = "3.8.*" },
-    { version = "^1.25", python = "^3.9" },
+    { version = "^1.25", python = ">=3.9,<3.13" },
 ]
 skyfield-data = ">=3,<6"
 python-dateutil = "^2.8"