chore: Release const-hex version 1.9.1 #258

Job	Run time
Test (x86_64-unknown-linux-gnu, nightly)	26s
Test (x86_64-unknown-linux-gnu, beta)	22s
feature checks	1m 16s
Fuzz	31s
Test (x86_64-unknown-linux-gnu, stable)	17s
Miri (x86_64-unknown-linux-gnu, --no-default-features)	1m 13s
Test (x86_64-unknown-linux-gnu, 1.64)	32s
Miri (x86_64-unknown-linux-gnu)	1m 16s
Test (aarch64-unknown-linux-gnu, nightly)	58s
Test (aarch64-unknown-linux-gnu, beta)	1m 13s
Clippy	24s
Miri (x86_64-unknown-linux-gnu, --all-features)	1m 5s
Test (aarch64-unknown-linux-gnu, stable)	40s
Miri (x86_64-unknown-linux-gnu, --features force-generic)	1m 36s
Test (aarch64-unknown-linux-gnu, 1.64)	47s
docs	21s
fmt	13s
Outdated	10s
	13m 20s

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