CI: Add xfail for clip

Author: mtsokol

tools/ci/array-api-xfails.txt

@@ -18,3 +18,6 @@ array_api_tests/test_sorting_functions.py::test_sort
 # ufuncs signature on linux is always <Signature (*args, **kwargs)>
 # np.vecdot is the only ufunc with a keyword argument which causes a failure
 array_api_tests/test_signatures.py::test_func_signature[vecdot]
+
+# input is cast to min/max's dtype if they're different
+array_api_tests/test_operators_and_elementwise_functions.py::test_clip