Merge branch 'release-v1.13.0' into erikj/faster_device_lists_fetch

MANIFEST.in

UPGRADE.rst

changelog.d/7172.misc

changelog.d/7363.misc

changelog.d/7368.bugfix

changelog.d/7369.misc

changelog.d/7387.bugfix

changelog.d/7393.bugfix

changelog.d/7394.misc

changelog.d/7395.misc

changelog.d/7401.feature

changelog.d/7404.misc

changelog.d/7408.misc

stubs/txredisapi.pyi

synapse/api/auth.py

synapse/app/generic_worker.py

synapse/events/snapshot.py

synapse/federation/federation_client.py

synapse/federation/transport/client.py

synapse/groups/groups_server.py