Fix dtype of numba dispatch of ArgSort

Author: ricardoV94

pytensor/link/numba/dispatch/basic.py

@@ -466,7 +466,7 @@ def argort_vec(X, axis):
             axis = axis.item()
 
             Y = np.swapaxes(X, axis, 0)
-            result = np.empty_like(Y)
+            result = np.empty_like(Y, dtype="int64")
 
             indices = list(np.ndindex(Y.shape[1:]))