Update testnet soroban settings file #6405

Job	Run time
fmt	25s
rust-check-git-rev-deps	15s
cargo-deny (advisories)	45s
build (gcc, current)	27m 13s
cargo-deny (bans licenses sources)	43s
build (gcc, current, --check-test-tx-meta)	15m 50s
build (gcc, next)	32m 8s
build (gcc, next, --check-test-tx-meta)	18m 58s
build (clang, current)	24m 52s
build (clang, current, --check-test-tx-meta)	15m 30s
build (clang, next)	25m 43s
build (clang, next, --check-test-tx-meta)	16m 18s
complete	1s
	2h 58m 41s

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