Update stellar-core to v20.1.0 in latest image #605

Job	Run time
amd64 / build-stellar-core	39s
amd64 / build-rs-stellar-xdr	2m 42s
amd64 / build-stellar-friendbot	50s
amd64 / build-stellar-horizon	2m 34s
amd64 / build-stellar-soroban-rpc	2m 46s
arm64 / build-rs-stellar-xdr	2m 58s
arm64 / build-stellar-core	35s
arm64 / build-stellar-horizon	8m 14s
arm64 / build-stellar-friendbot	4m 41s
arm64 / build-stellar-soroban-rpc	1m 47s
amd64 / build	5m 30s
arm64 / build	7m 29s
amd64 / test (pubnet)	1m 25s
amd64 / test (local)	1m 40s
amd64 / push-pr	47s
amd64 / test (local, --enable-soroban-rpc)	1m 51s
amd64 / push-release	0s
arm64 / test (pubnet)	1m 14s
arm64 / test (local)	2m 41s
arm64 / push-pr	56s
arm64 / test (local, --enable-soroban-rpc)	2m 45s
arm64 / push-release	0s
manifest / push	10s
complete	1s
	54m 15s

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