Bump Substrate/Polkadot/Cumulus refs (#1295)

Substrate: 31d90c202d6df9ce3837ee55587b604619a912ba
Polkadot: 60df3c55c711c2872872d6220f98b2611340e051
Cumulus: a9630551c2

bridges/modules/grandpa/src/lib.rs

@@ -101,6 +101,7 @@ pub mod pallet {
 	}
 
 	#[pallet::pallet]
+	#[pallet::without_storage_info]
 	pub struct Pallet<T, I = ()>(PhantomData<(T, I)>);
 
 	#[pallet::hooks]

bridges/modules/grandpa/src/mock.rs

@@ -77,6 +77,7 @@ impl frame_system::Config for TestRuntime {
 	type BlockLength = ();
 	type SS58Prefix = ();
 	type OnSetCode = ();
+	type MaxConsumers = frame_support::traits::ConstU32<16>;
 }
 
 parameter_types! {