Update dependency react-instantsearch-dom to v6.16.0

Editor assessment

The subject names react-instantsearch-dom and pins the update to v6.16.0, leaving no ambiguity about what changed. Using fix for a dependency bump rather than chore is a defensible choice where the update patches behavior, and the deps scope is precise; the taxonomy straddle is not penalized. There is no body, which is fine for a mechanical version bump whose motivation is inherent to dependency maintenance. No footers appear beyond the header, so there is no noise to judge. The subject is imperative, unperioded, and comfortably short, with no ticket junk. A complete and honest maintenance message that communicates everything a reader needs without opening the diff.