Bump proptest from 1.5.0 to 1.6.0 #34190

Job	Run time
cargo-tests	12m 32s
formatting	1m 45s
ShellCheck	22s
spelling	4m 11s
svelte-lint	1m 28s
vitest-shard-1-of-2	4m 9s
vitest-shard-2-of-2	4m 5s
Config is as expected	35s
Can get NNS proposal args	0s
Migration test utilities work	21s
minor-version-bump-works	1m 35s
Release template	3m 25s
IC Commit	24s
small-tests (ubuntu-20.04)	1m 43s
The nns-dapp npm and cargo versions should match	58s
small-tests (macos-13)	2m 8s
checks-pass	3s
	39m 44s

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