Use stellar-core upgrade config set command #516

Job	Run time
amd64 / build-stellar-core	44s
amd64 / build-stellar-horizon	3m 45s
amd64 / build-stellar-soroban-rpc	1m 12s
amd64 / build-stellar-friendbot	49s
arm64 / build-stellar-core	26s
arm64 / build-stellar-horizon	10m 44s
arm64 / build-stellar-friendbot	3m 25s
arm64 / build-stellar-soroban-rpc	44s
amd64 / build	3m 0s
amd64 / test (pubnet)	2m 15s
amd64 / test (local)	1m 43s
amd64 / push-pr	39s
amd64 / push-release	0s
arm64 / build	6m 54s
arm64 / test (pubnet)	1m 27s
arm64 / test (local)	2m 40s
arm64 / push-pr	2m 35s
arm64 / push-release	0s
manifest / push	8s
complete	1s
	43m 11s

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