Use RuntimeHoldReason for the NIS pallet HoldReason (#7017)

* Use RuntimeHoldReason for the NIS pallet HoldReason

* Update substrate

* Fixes

* Fixes

* Fixes

* Fixes

* Move encoding test to tests.rs

polkadot/runtime/kusama/src/tests.rs

@@ -25,6 +25,11 @@ use runtime_common::MinimumMultiplier;
 use separator::Separatable;
 use sp_runtime::FixedPointNumber;
 
+#[test]
+fn nis_hold_reason_encoding_is_correct() {
+	assert_eq!(NisHoldReason::get().encode(), [38, 0]);
+}
+
 #[test]
 fn remove_keys_weight_is_sensible() {
 	use runtime_common::crowdloan::WeightInfo;