Rust

Update attest-mock digest to efbb187 #52348

Job	Run time
check-omicron-deployment (macos-14)	1m 4s
clippy-lint	1m 10s
check-style	25s
check-features	1m 17s
check-omicron-deployment (ubuntu-22.04)	1m 41s
build-docs	1m 35s
	7m 12s

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