suggestion to don't clone `self` in `get_block` #2121

Job	Run time
Generate crates matrix	9s
Check crates matrix	2s
Build zebrad crate	36m 51s
Build zebra-utils crate	17m 2s
Build zebra-test crate	1m 25s
Build zebra-state crate	22m 27s
Build zebra-script crate	3m 13s
Build zebra-scan crate	26m 22s
Build zebra-rpc crate	34m 5s
Build zebra-node-services crate	3m 5s
Build zebra-network crate	6m 42s
Build zebra-grpc crate	15m 3s
Build zebra-consensus crate	17m 28s
Build zebra-chain crate	4m 39s
Build tower-fallback crate	57s
Build tower-batch-control crate	1m 22s
Open or update issues for building crates individually failures	0s
	3h 10m 52s

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