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This PR upgrades the app to 6.1.6.1, the latest released version of Rails as of this writing. According to this page, Rails 6.0.x (the version the app is currently running on) receives updates for "severe security issues" but not for "security issues." Rails 6.1.x receives updates for both "severe security issues" and "security issues." Only 7.0 is guaranteed to receive bug fixes, though I think bug fixes aren't especially important for this app.
Test plan