fix(arrays): return -1 from sorted_last_index_of on empty array

sorted_last_index returns 0 for an empty array (and for any value smaller
than every element), so index becomes -1. The guard only bounded index
from above, so array[-1] was evaluated on an empty list and raised
IndexError. Add the lower-bound check so a negative index is reported as
not found, matching sorted_index_of.

src/pydash/arrays.py

@@ -1794,7 +1794,7 @@ def sorted_last_index_of(
     """
     index = sorted_last_index(array, value) - 1
 
-    if index < len(array) and array[index] == value:
+    if 0 <= index < len(array) and array[index] == value:
         return index
     else:
         return -1