ci: satisfy `cargo deny` #112

Job	Run time
Cargo Deadlinks	7m 48s
Clippy Lints	2m 20s
Cargo Check	2m 4s
Cargo Test	8m 0s
Cargo MSRV	3m 24s
Cargo Deny (advisories)	15s
Cargo Deny (bans licenses sources)	17s
	24m 8s

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