Remove np.float due to deprecation error

At [this line](https://github.com/pysal/spglm/blob/7b00f42eaee795142e90aba2435d4ce34e8613fe/spglm/iwls.py#L111), Numpy 1.24 will raise an error for `np.float` which is deprecated. This causes error in downstream `mgwr`'s auto testing.

[Numpy 1.24 release note](https://numpy.org/devdocs/release/1.24.0-notes.html#expired-deprecations)

Author: Ziqi-Li

spglm/iwls.py

@@ -108,7 +108,7 @@ def iwls(y, x, family, offset, y_fix,
     diff = 1.0e6
 
     if ini_betas is None:
-        betas = np.zeros((x.shape[1], 1), np.float)
+        betas = np.zeros((x.shape[1], 1))
     else:
         betas = ini_betas