chore: prepare 0.8.1 release #1376

Job	Run time
Check	26s
coverage	2m 59s
clippy	30s
Rustfmt	13s
Test Suite (self-hosted, linux, x64, intel)	2m 24s
Test Suite (ubuntu-latest-arm-8-cores, --cfg=aes_armv8)	4m 23s
Test Suite (self-hosted, macos, arm64, --cfg=aes_armv8)	2m 20s
Test Suite (macos-13, stable)	3m 38s
Test Suite (windows-2019)	4m 47s
Build library (self-hosted, linux, x64, intel, libpost.so, libpost.a, linux)	2m 4s
Build library (ubuntu-latest-arm-8-cores, libpost.so, libpost.a, --cfg=aes_armv8, linux-arm64)	2m 17s
Build library (self-hosted, macos, arm64, libpost.dylib, libpost.a, --cfg=aes_armv8, macos-m1)	1m 12s
Build library (macos-13, libpost.dylib, libpost.a, macos)	3m 32s
Build library (windows-2019, post.dll, post.lib, windows)	6m 47s
Publish release	0s
	37m 32s

Provide feedback