Exclude a miri job #181

Job	Run time
Miri (x86_64-unknown-linux-gnu, --no-default-features)	57s
Miri (x86_64-unknown-linux-gnu)	1m 20s
Miri (x86_64-unknown-linux-gnu, --all-features)	1m 6s
Miri (aarch64-unknown-linux-gnu, --no-default-features)	1m 30s
Miri (aarch64-unknown-linux-gnu)	1m 33s
Test (x86_64-unknown-linux-gnu, nightly)	27s
Test (x86_64-unknown-linux-gnu, beta)	20s
Test (x86_64-unknown-linux-gnu, stable)	30s
Test (x86_64-unknown-linux-gnu, 1.64)	28s
Test (aarch64-unknown-linux-gnu, nightly)	1m 4s
Test (aarch64-unknown-linux-gnu, beta)	58s
Test (aarch64-unknown-linux-gnu, stable)	59s
Test (aarch64-unknown-linux-gnu, 1.64)	57s
feature checks	28s
Fuzz	41s
docs	18s
fmt	13s
Outdated	6s
Clippy	27s
	14m 22s

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