build(deps): bump proptest from 1.5.0 to 1.6.0 #1468

Job	Run time
Check	1m 42s
clippy	1m 45s
Rustfmt	29s
coverage	2m 57s
Test Suite (self-hosted, linux, x64, intel)	3m 53s
Test Suite (ubuntu-latest-arm-8-cores, --cfg=aes_armv8)	7m 40s
Test Suite (self-hosted, macos, arm64, --cfg=aes_armv8)	5m 26s
Test Suite (macos-13, stable)	10m 28s
Test Suite (windows-2019)	12m 5s
Build library (self-hosted, linux, x64, intel, libpost.so, libpost.a, linux)	3m 1s
Build library (ubuntu-latest-arm-8-cores, libpost.so, libpost.a, --cfg=aes_armv8, linux-arm64)	5m 17s
Build library (self-hosted, macos, arm64, libpost.dylib, libpost.a, --cfg=aes_armv8, macos-m1)	3m 29s
Build library (macos-13, libpost.dylib, libpost.a, macos)	13m 33s
Build library (windows-2019, post.dll, post.lib, windows)	11m 27s
Publish release	0s
	1h 23m 12s

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