Proposed change: We previously tried using dependabot to automatically update our crate dependencies (#1909), but gave up because it would open one PR for every crate that has a new version.

As of 8/25/2023, grouped updates for dependabot are officially supported:
dependabot/dependabot-core#1190 (comment)

Motivation: Keep our dependencies up-to-date, and reduce the number of manual steps for performing a release.