Chrono: allow deprecation warning until upgrading to 0.4.35+

Requirering 0.4.35 is blocked on MSRV (Chrono: 1.61, PyO3: 1.56)

src/conversions/chrono.rs

@@ -39,6 +39,11 @@
 //!     });
 //! }
 //! ```
+
+// `chrono::Duration` has been renamed to `chrono::TimeDelta` and its constructor changed
+// TODO: upgrade to Chrono 0.4.35+ after upgrading our MSRV to 1.61+
+#![allow(deprecated)]
+
 use crate::exceptions::{PyTypeError, PyUserWarning, PyValueError};
 #[cfg(Py_LIMITED_API)]
 use crate::sync::GILOnceCell;