removes the vector allocation in shred::merkle::make_merkle_proof #16566

Job	Run time
check (associated-token-account)	3m 49s
cargo-test-sbf (associated-token-account)	6m 53s
check (feature-proposal)	2m 48s
test_cli (single-pool)	18m 27s
cargo-test-sbf (feature-proposal)	7m 16s
check (instruction-padding)	1m 35s
test_cli (token-2022)	18m 44s
check (memo)	3m 7s
cargo-test-sbf (instruction-padding)	5m 53s
check (record)	1m 48s
cargo-test-sbf (memo)	6m 11s
check (single-pool)	8m 32s
cargo-test-sbf (record)	7m 38s
check (slashing)	1m 23s
cargo-test-sbf (single-pool)	8m 31s
check (stake-pool)	2m 48s
cargo-test-sbf (slashing)	16m 48s
check (token-2022)	4m 45s
cargo-test-sbf (stake-pool)	10m 17s
cargo-test-sbf (token-2022)	7m 10s
	2h 24m 23s

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