Recover clippy test.

[tushushu]

The clippy test shows the errors below, which is not expected:

error: deref on an immutable reference
  --> src/lib.rs:80:34
   |
80 | fn hash128_x[64](https://github.com/tushushu/murmurust/runs/7928640580?check_suite_focus=true#step:6:65)(_py: Python, key: &str, seed: u32, signed: bool) -> Py<PyAny> {
   |                                  ^ help: if you would like to reborrow, try removing `&*`: `&`
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#borrow_deref_ref

This is going to be fixed by PyO3/pyo3#2555. Currently, I have to disable the clippy errors, and when PYO3 0.17.0 released, we need change it back.