Merge branch 'release-v1.13.0' into develop

changelog.d/7420.misc

changelog.d/7423.misc

changelog.d/7427.feature

synapse/api/auth.py

synapse/api/auth_blocking.py

synapse/handlers/sync.py

synapse/replication/tcp/handler.py

synapse/replication/tcp/redis.py

synapse/storage/data_stores/main/devices.py

synapse/util/caches/stream_change_cache.py

tests/api/test_auth.py

tests/handlers/test_auth.py

tests/handlers/test_sync.py

tests/test_mau.py