updated core ref on build-soroban-dev target #378

Job	Run time
amd64 / build-stellar-core	40s
amd64 / build-stellar-friendbot	1m 0s
amd64 / build-stellar-horizon	3m 0s
amd64 / build-stellar-soroban-rpc	1m 6s
arm64 / build-stellar-core	23s
arm64 / build-stellar-friendbot	2m 50s
arm64 / build-stellar-horizon	10m 39s
arm64 / build-stellar-soroban-rpc	53s
amd64 / build	3m 11s
amd64 / test (testnet)	3m 2s
amd64 / push-pr	47s
amd64 / test (pubnet)	1m 51s
amd64 / test (standalone)	1m 42s
amd64 / test (standalone, --enable-horizon-captive-core)	1m 46s
amd64 / push-release	0s
arm64 / build	9m 47s
arm64 / test (testnet)	16m 31s
arm64 / push-pr	41s
arm64 / test (pubnet)	1m 14s
arm64 / test (standalone)	2m 15s
arm64 / test (standalone, --enable-horizon-captive-core)	2m 21s
arm64 / push-release	0s
manifest / push	8s
complete	1s
	1h 5m 48s

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