message: Add allow for clippy false positive
diff: @@ -82,11 +82,15 @@ where
  {
  type Item = Case;
  + #[allow(clippy::mut_mutex_lock)]
  fn poll_next(
  self: std::pin::Pin<&mut Self>,
  cx: &mut std::task::Context<'_>,
  ) -> std::task::Poll<Option<Self::Item>> {
  let this = self.project();
  + // this code triggers false positive in Clippy
  + // https://github.com/rust-lang/rust-clippy/issues/9415
  + // TODO: remove #[allow] once fix reaches nightly.
  let inner = this.inner.lock().unwrap();
  let mut inner = Pin::new(inner);
  let inner_peek = inner.as_mut().peek();
  