* release-v1.13.0:
  Don't UPGRADE database rows
  RST indenting
  Put rollback instructions in upgrade notes
  Fix changelog typo
  Oh yeah, RST
  Absolute URL it is then
  Fix upgrade notes link
  Provide summary of upgrade issues in changelog. Fix )
  Move next version notes from changelog to upgrade notes
  Changelog fixes
  1.13.0rc1
  Documentation on setting up redis (#7446)
  Rework UI Auth session validation for registration (#7455)
  Fix errors from malformed log line (#7454)
  Drop support for redis.dbid (#7450)

Be less strict about validation of UI authentication sessions during
registration to match client expecations.

Since we only use pubsub, the dbid is irrelevant.

Update docker runtime image to Alpine v3.11

Add dummy_events_threshold which allows configuring the number of forward extremities a room needs for Synapse to send forward extremities in it.

For the record, the reason we need this is as follows:

each RDATA command comes down the redis pipe as a subscription message. txredisapi as written needs at least three reactor ticks to read each subscription message from the tcp buffer. Hence, once the process gets loaded, it starts getting behind, and eventually redis knifes the connection. it then takes ages for the master to work its way through the backlog, before it reconnects again, during which any commands from any workers are dropped.

Make get_e2e_cross_signing_key delegate to get_e2e_cross_signing_keys_bulk

... mostly because the latter has a cache.

There's no point carefully dividing a list into batches, and then completely
ignoring the batches.

use an upsert to update device_lists_outbound_last_success

most of these params don't really need to be lists.

Speed up fetching device lists changes in sync.

Fix lost events on replication reconnection