chore: Release const-hex version 1.7.0 #184

Job	Run time
Fuzz	32s
Miri (x86_64-unknown-linux-gnu, --no-default-features)	1m 5s
Miri (x86_64-unknown-linux-gnu)	1m 16s
Miri (x86_64-unknown-linux-gnu, --all-features)	1m 24s
Miri (aarch64-unknown-linux-gnu, --no-default-features)	1m 2s
Miri (aarch64-unknown-linux-gnu)	1m 10s
Test (x86_64-unknown-linux-gnu, nightly)	30s
Test (x86_64-unknown-linux-gnu, beta)	25s
Test (x86_64-unknown-linux-gnu, stable)	30s
Test (x86_64-unknown-linux-gnu, 1.64)	35s
Test (aarch64-unknown-linux-gnu, nightly)	46s
Test (aarch64-unknown-linux-gnu, beta)	44s
Test (aarch64-unknown-linux-gnu, stable)	46s
Test (aarch64-unknown-linux-gnu, 1.64)	1m 4s
Clippy	22s
docs	48s
feature checks	1m 2s
fmt	48s
Outdated	45s
	15m 34s

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