[decompiler] Downgrade to bytecode v6 for Revela #72156

Job	Run time
file_change_determinator	11s
rust-doc-tests	5m 4s
rust-unit-tests	0s
rust-consensus-only-smoke-test	0s
rust-consensus-only-unit-test	0s
rust-cargo-deny	1m 44s
rust-lints	3m 42s
general-lints	29s
rust-build-cached-packages	2m 9s
rust-check-merge-base	1m 13s
rust-cryptohasher-domain-separation-check	0s
rust-smoke-tests	27m 45s
rust-targeted-unit-tests	5m 31s
	47m 48s

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