Increase BlockHashCount parameter (#6037)

polkadot/runtime/common/src/lib.rs

@@ -75,7 +75,7 @@ const_assert!(NORMAL_DISPATCH_RATIO.deconstruct() >= AVERAGE_ON_INITIALIZE_RATIO
 
 // Common constants used in all runtimes.
 parameter_types! {
-	pub const BlockHashCount: BlockNumber = 2400;
+	pub const BlockHashCount: BlockNumber = 4096;
 	/// The portion of the `NORMAL_DISPATCH_RATIO` that we adjust the fees with. Blocks filled less
 	/// than this will decrease the weight and more will increase.
 	pub const TargetBlockFullness: Perquintill = Perquintill::from_percent(25);