chore: Release const-hex version 1.12.0 #558

Job	Run time
feature checks	22s
Test (aarch64-unknown-linux-gnu, nightly)	40s
Test (aarch64-unknown-linux-gnu, stable)	40s
Clippy	17s
docs	24s
fmt	13s
Test (aarch64-unknown-linux-gnu, 1.64)	1m 25s
Test (i686-unknown-linux-gnu, nightly)	38s
Fuzz	49s
Outdated	12s
Test (i686-unknown-linux-gnu, stable)	56s
Miri (x86_64-unknown-linux-gnu)	1m 4s
Test (i686-unknown-linux-gnu, 1.64)	1m 4s
Test (x86_64-unknown-linux-gnu, nightly)	21s
Miri (x86_64-unknown-linux-gnu, -Fforce-generic)	57s
Test (x86_64-unknown-linux-gnu, stable)	24s
Miri (aarch64-unknown-linux-gnu)	59s
Test (x86_64-unknown-linux-gnu, 1.64)	57s
Miri (aarch64-unknown-linux-gnu, -Fforce-generic)	59s
	13m 21s

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