Dendrite 0.13.1

This releases fixes a long-standing "off-by-one" error which could result in state resets. Upgrading to this version is highly recommended.

When deduplicating state events, we were checking if the event in question was already in a state snapshot. If it was in a previous state snapshot, we would
then remove it from the list of events to store. If this happened, we were, unfortunately, skipping the next event to check. This resulted in
events getting stored in state snapshots where they may not be needed. When we now compared two of those state snapshots, one of them
contained the skipped event, while the other didn't. This difference possibly shouldn't exist, resulting in unexpected state resets and explains
reports of missing state events as well.

Rooms where a state reset occurred earlier should, hopefully, reconcile over time.

Fixes:

• A long-standing "off-by-one" error has been fixed, which could result in state resets
• Roomserver Prometheus Metrics are available again

Features

• Updated dependencies
  • Internal NATS Server has been updated from v2.9.15 to v2.9.19

What's Changed

• Fix adding state events to the database by @S7evinK in #3133
• Version 0.13.1 by @S7evinK in #3136

Full Changelog: v0.13.0...v0.13.1