ci: set retention on uploaded artifacts (#104) #416

Job	Run time
version	4s
security	19s
cargo-deny (advisories + licenses)	20s
mutation	15m 21s
Coverage (llvm-cov)	1m 30s
lint	1m 18s
test (macos-latest)	2m 15s
test (ubuntu-latest)	1m 24s
test (windows-latest)	3m 18s
	25m 49s

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