Fix approval-voting canonicalize off by one #16250

Job	Run time
check-dependency-rules	7s
check-fail-ci	13s
check-readme	2m 58s
check-markdown	16s
check-workspace	18s
preflight / preflight	42s
preflight / ci-versions	1m 3s
check-rust-feature-propagation	2m 5s
fmt	1m 10s
check-toml-format	59s
check-umbrella	2m 18s
test-rust-features	2m 0s
All quick checks passed	1s
	14m 10s

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