* commit '43726783e': (22 commits)
1.17.0rc1
Fix some spelling mistakes / typos. (#7811)
`update_membership` declaration: now always returns an event id. (#7809)
Improve stacktraces from exceptions in background processes (#7808)
Fix `can only concatenate list (not "tuple") to list` exception (#7810)
Pass original request headers from workers to the main process. (#7797)
Generate real events when we reject invites (#7804)
Add `HomeServer.signing_key` property (#7805)
Revert "Update the installation docs on apt-transport-https (#7801)"
Do not use simplejson in Synapse. (#7800)
Stop passing bytes when dumping JSON (#7799)
Update the installation docs on apt-transport-https (#7801)
shuffle changelog slightly
Change Caddy links (old is deprecated) (#7789)
Stop populating unused table `local_invites`. (#7793)
Refactor getting replication updates from database v2. (#7740)
Add libwebp dependency to Dockerfile (#7791)
Add documentation for JWT login type and improve sample config. (#7776)
Convert the appservice handler to async/await. (#7775)
Don't ignore `set_tweak` actions with no explicit `value`. (#7766)
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