Merge branch 'develop' of github.com:matrix-org/synapse into hawkowl/cache-config-without-synctl

* 'develop' of github.com:matrix-org/synapse: (43 commits)
  Remove unused store method get_hosts_in_room (#7448)
  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)
  Extend spam checker to allow for multiple modules (#7435)
  Implement OpenID Connect-based login (#7256)
  Add room details admin endpoint (#7317)
  Fix errors from malformed log line (#7454)
  Drop support for redis.dbid (#7450)
  Fixes typo (bellow -> below) (#7449)
  ...

Author: anoadragon453