Trivial Rust code modification to make Rust workflows run #3

Job	Run time
Generate crates matrix	17s
Check crates matrix	3s
Build tower-batch-control crate	28s
Build tower-fallback crate	27s
Build zebra-chain crate	2m 5s
Build zebra-consensus crate	7m 40s
Build zebra-network crate	2m 4s
Build zebra-node-services crate	1m 52s
Build zebra-rpc crate	7m 43s
Build zebra-scan crate	1m 7s
Build zebra-script crate	1m 33s
Build zebra-state crate	7m 20s
Build zebra-test crate	56s
Build zebra-utils crate	7m 56s
Build zebrad crate	10m 58s
Open or update issues for building crates individually failures	0s
	52m 29s

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