Update Rust crate proptest to 1.6.0 - autoclosed #1444

Job	Run time
Cross-compile to aarch64	1m 37s
Build and test core crates (ubuntu-latest, 1.78)	1m 52s
Build and test (all features) (ubuntu-latest, 1.78)	3m 10s
Build documentation (ubuntu-latest)	58s
Build and test core crates (ubuntu-latest, stable)	1m 58s
Build and test (all features) (ubuntu-latest, stable)	2m 57s
Lint	1m 26s
Build and test core crates (macos-14, 1.78)	1m 46s
cargo-compare extended tests (ubuntu-latest)	2m 24s
Build and test (all features) (macos-14, 1.78)	2m 57s
cargo-compare extended tests (macos-14)	2m 37s
Build and test (all features) (macos-14, stable)	2m 29s
Build and test (all features) (windows-latest, 1.78)	6m 10s
Build and test core crates (macos-14, stable)	1m 49s
Build and test core crates (windows-latest, 1.78)	3m 52s
Build and test (all features) (windows-latest, stable)	6m 43s
Build and test core crates (windows-latest, stable)	5m 58s
	50m 43s

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