Bump mypy from 1.5.1 to 1.8.0 (#16901)

poetry.lock

synapse/handlers/auth.py

synapse/handlers/sso.py

synapse/logging/context.py

synapse/module_api/callbacks/spamchecker_callbacks.py

synapse/storage/database.py

synapse/storage/databases/main/events_worker.py

synapse/streams/events.py

synapse/util/async_helpers.py

synapse/util/caches/dictionary_cache.py

synapse/util/caches/expiringcache.py

tests/rest/client/test_filter.py