Make CI work (#1079)

MR#1076 somehow broke the check-runtime-benchmarks CI.

Signed-off-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io>

parachain-template/runtime/Cargo.toml

@@ -140,6 +140,7 @@ runtime-benchmarks = [
 	"pallet-template/runtime-benchmarks",
 	"pallet-timestamp/runtime-benchmarks",
 	"pallet-xcm/runtime-benchmarks",
+	"polkadot-runtime/runtime-benchmarks",
 	"sp-runtime/runtime-benchmarks",
 	"xcm-builder/runtime-benchmarks",
 	"cumulus-pallet-session-benchmarking/runtime-benchmarks",