Merge branch 'release-v0.24.1' of github.com:matrix-org/synapse

CHANGES.rst

synapse/__init__.py

synapse/app/_base.py

synapse/appservice/scheduler.py

synapse/config/server.py

synapse/crypto/context_factory.py

synapse/crypto/event_signing.py

synapse/crypto/keyring.py

synapse/event_auth.py

synapse/events/builder.py

synapse/events/spamcheck.py

synapse/federation/transport/client.py

synapse/federation/transport/server.py

synapse/groups/groups_server.py

synapse/handlers/auth.py

synapse/handlers/federation.py

synapse/handlers/initial_sync.py

synapse/handlers/message.py

synapse/handlers/presence.py

synapse/handlers/profile.py