Use stellar-core upgrade config set command (#513) #518

Job	Run time
amd64 / build-stellar-core	22s
amd64 / build-stellar-friendbot	1m 3s
amd64 / build-stellar-horizon	3m 3s
amd64 / build-stellar-soroban-rpc	54s
arm64 / build-stellar-core	20s
arm64 / build-stellar-friendbot	4m 7s
arm64 / build-stellar-horizon	15m 19s
arm64 / build-stellar-soroban-rpc	45s
amd64 / build	3m 11s
amd64 / test (pubnet)	1m 50s
amd64 / push-pr	0s
amd64 / test (local)	1m 44s
amd64 / push-release	55s
arm64 / build	6m 50s
arm64 / test (pubnet)	1m 18s
arm64 / test (local)	2m 38s
arm64 / push-pr	0s
arm64 / push-release	53s
manifest / push	4s
complete	1s
	45m 17s

Provide feedback