Upgrade to Resonant v0.48.1

[brianhelba]

No description provided.

[brianhelba]

@naglepuff @BryonLewis I met with @bradking earlier today, who helped me to get the Mend Renovate Community service authorized to run on this repo (which provides us with a free robot for actually running Renovate to scan and make PRs). As a future note, while Resonant now contains the config for Renovate, you still need to set up the Mend robot if it's not installed on a GitHub organization.

I'll merge this now, which should create a new always-open issue for tracking dependency issues. The issue is interactive, so we can check boxes within it to trigger Renovate to run on-demand.

Rather than wait for the next scheduled Renovate run (on Sunday night by default), I'll also go ahead and request the PRs to be created now. Then we can discuss an actual upgrade plan (including whether we want to split out some dependencies to separately upgrade or fully pin) in the particular PRs.