chore: remove usage of slices in pedersen hash #14307

Job	Run time
build-acvm-js	1m 23s
build-nargo	2m 18s
build-noirc-abi	1m 28s
build-noir-wasm	3m 35s
ACVM JS (Node.js)	42s
ACVM JS (Browser)	1m 39s
noirc_abi	1m 37s
noir_codegen	1m 16s
Example scripts	16s
Noir JS	1m 23s
Check external repo - ${{ matrix.project.repo }}	0s
noir_wasm	1m 57s
Integration Tests (Node)	2m 29s
Integration Tests (Browser)	2m 1s
End	1s
	22m 5s

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