Lints from latest nightly

We can't adopt it due to some issue with building the runtime, but these are
good to have.

substrate/economic-security/pallet/src/lib.rs

@@ -1,6 +1,11 @@
 #![cfg_attr(not(feature = "std"), no_std)]
 
-#[allow(clippy::cast_possible_truncation, clippy::no_effect_underscore_binding, clippy::empty_docs)]
+#[allow(
+  unreachable_patterns,
+  clippy::cast_possible_truncation,
+  clippy::no_effect_underscore_binding,
+  clippy::empty_docs
+)]
 #[frame_support::pallet]
 pub mod pallet {
   use frame_system::pallet_prelude::*;