soroban sdk version bump + fixes #56

Job	Run time
Check config (ubuntu-latest)	3s
Check config (macos-latest)	16s
Build (ubuntu-latest)	4m 5s
Build (macos-latest)	11m 18s
Test (ubuntu-latest, avoid-core-mem-forget)	2m 24s
Test (ubuntu-latest, divide-before-multiply)	4m 34s
Test (ubuntu-latest, insufficiently-random-values)	2m 19s
Test (ubuntu-latest, overflow-check)	2m 12s
Test (ubuntu-latest, set-contract-storage)	4m 36s
Test (ubuntu-latest, unprotected-update-current-contract-wasm)	2m 22s
Test (ubuntu-latest, unsafe-expect)	2m 17s
Test (ubuntu-latest, unsafe-unwrap)	2m 52s
Test (macos-latest, avoid-core-mem-forget)	6m 11s
Test (macos-latest, divide-before-multiply)	10m 29s
Test (macos-latest, insufficiently-random-values)	11m 48s
Test (macos-latest, overflow-check)	8m 8s
Test (macos-latest, set-contract-storage)	8m 49s
Test (macos-latest, unprotected-update-current-contract-wasm)	8m 24s
Test (macos-latest, unsafe-expect)	7m 17s
Test (macos-latest, unsafe-unwrap)	5m 55s
	1h 46m 19s

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