soroban sdk version bump + fixes #55

Job	Run time
Check config (ubuntu-latest)	4s
Check config (macos-latest)	9s
Build (ubuntu-latest)	3m 54s
Build (macos-latest)	9m 44s
Test (ubuntu-latest, avoid-core-mem-forget)	2m 19s
Test (ubuntu-latest, divide-before-multiply)	4m 55s
Test (ubuntu-latest, insufficiently-random-values)	2m 18s
Test (ubuntu-latest, overflow-check)	2m 36s
Test (ubuntu-latest, set-contract-storage)	4m 55s
Test (ubuntu-latest, unprotected-update-current-contract-wasm)	2m 24s
Test (ubuntu-latest, unsafe-expect)	2m 23s
Test (ubuntu-latest, unsafe-unwrap)	2m 25s
Test (macos-latest, avoid-core-mem-forget)	9m 38s
Test (macos-latest, divide-before-multiply)	8m 54s
Test (macos-latest, insufficiently-random-values)	7m 40s
Test (macos-latest, overflow-check)	9m 3s
Test (macos-latest, set-contract-storage)	11m 23s
Test (macos-latest, unprotected-update-current-contract-wasm)	8m 50s
Test (macos-latest, unsafe-expect)	10m 16s
Test (macos-latest, unsafe-unwrap)	13m 13s
	1h 57m 3s

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