added pallet-proxy in rococo feature dependencies (#3486)

runtime/rococo/Cargo.toml

@@ -116,6 +116,7 @@ std = [
 	"pallet-session/std",
 	"pallet-staking/std",
 	"pallet-offences/std",
+	"pallet-proxy/std",
 	"pallet-timestamp/std",
 	"pallet-transaction-payment/std",
 	"pallet-transaction-payment-rpc-runtime-api/std",
@@ -163,6 +164,7 @@ runtime-benchmarks = [
 	"pallet-grandpa/runtime-benchmarks",
 	"pallet-im-online/runtime-benchmarks",
 	"pallet-indices/runtime-benchmarks",
+	"pallet-proxy/runtime-benchmarks",
 	"pallet-staking/runtime-benchmarks",
 	"pallet-timestamp/runtime-benchmarks",
 	"pallet-xcm/runtime-benchmarks",
@@ -183,6 +185,7 @@ try-runtime = [
 	"pallet-im-online/try-runtime",
 	"pallet-membership/try-runtime",
 	"pallet-session/try-runtime",
+	"pallet-proxy/try-runtime",
 	"pallet-staking/try-runtime",
 	"pallet-offences/try-runtime",
 	"pallet-timestamp/try-runtime",