use issubctype instead of issubdtype (which also works with numpy 2.0)

geb/agents/crop_farmers.py

@@ -1890,7 +1890,7 @@ def get_yield_ratio(
         return yield_ratio
 
     def decompress(self, array):
-        if np.issubsctype(array, np.floating):
+        if np.issubdtype(array, np.floating):
             nofieldvalue = np.nan
         else:
             nofieldvalue = -1