Update Rust nightly.

Removes feature(generic_associated_types)

examples/stm32l0/src/bin/lorawan.rs

@@ -3,7 +3,6 @@
 #![no_main]
 #![macro_use]
 #![allow(dead_code)]
-#![feature(generic_associated_types)]
 #![feature(type_alias_impl_trait)]
 
 use embassy_executor::Spawner;