validate that invert kwarg is boolean

Author: ndgrigorian

dpctl/tensor/_set_functions.py

@@ -698,6 +698,9 @@ def isin(
     du.validate_usm_type(res_usm_type, allow_none=False)
     sycl_dev = exec_q.sycl_device
 
+    if invert not in [True, False]:
+        raise ValueError(f"`invert` must be `True` or `False`, got {invert}")
+
     x_dt = _get_dtype(x, sycl_dev)
     test_dt = _get_dtype(test_elements, sycl_dev)
     if not all(_validate_dtype(dt) for dt in (x_dt, test_dt)):