[NumPy] Remove references to deprecated NumPy type aliases.

This change replaces references to a number of deprecated NumPy type aliases (np.bool, np.int, np.float, np.complex, np.object, np.str) with their recommended replacement (bool, int, float, complex, object, str).

NumPy 1.24 drops the deprecated aliases, so we must remove uses before updating NumPy.

PiperOrigin-RevId: 497194550

Author: hawkinsp

Diff for: research/pate_2018/core.py

@@ -152,7 +152,7 @@ def rdp_gaussian(logq, sigma, orders):
     if np.isscalar(orders):
       return 0.
     else:
-      return np.full_like(orders, 0., dtype=np.float)
+      return np.full_like(orders, 0., dtype=float)
 
   variance = sigma**2
 

Diff for: tensorflow_privacy/privacy/optimizers/dp_optimizer_test.py

@@ -43,7 +43,7 @@ def _compute_expected_gradients(self, per_example_gradients, l2_norm_clip,
         np.reshape(
             per_example_gradients,
             [num_microbatches,
-             np.int(batch_size / num_microbatches), num_vars]),
+             int(batch_size / num_microbatches), num_vars]),
         axis=1)
     microbatch_gradients_norms = np.linalg.norm(microbatch_gradients, axis=1)