[circuits] Use swap_bytes for SHA-256 & SHA-512 digest BE to LE #6325

Job	Run time
rust-checks-arm64	29s
rust-doc	28s
pre-commit-arm64	47s
pre-commit-x86_64	47s
rust-test-arm64	2m 44s
rust-test-all-features-arm64	3m 5s
rust-wasm-build-arm64	52s
rust-test-all-features-x86_64	3m 53s
rust-wasm-build-x86_64	55s
circuits-snapshot (zklogin)	1m 32s
circuits-snapshot (keccak)	1m 30s
circuits-snapshot (sha512)	1m 28s
circuits-snapshot (sha256)	1m 27s
rust-test-x86_64	4m 16s
rust-checks-x86_64	39s
circuits-snapshot (hash_based_sig)	1m 35s
circuits-snapshot (ethsign)	1m 29s
	27m 56s

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