chore: rm redundant to_vec #6707

Job	Run time
Cargo Check	5m 30s
Examples	5m 56s
Check Verifier `no_std`	1m 17s
Build patches and zkvm in host	1m 23s
Formatting & Clippy	5m 32s
Check lock files	6m 30s
Test (ARM)	32m 26s
Test Verifier Crate	15m 55s
Test (x86-64)	29m 4s
Spell Check	3m 12s
	1h 46m 45s

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