refactor: apply future type hints style (#416)

* refactor: apply future style type hints

* chore: put cryptography out of dev dependencies

tests/assets/sqlite_migrate/conftest_.py

@@ -1,5 +1,7 @@
+from __future__ import annotations
+
 import asyncio
-from typing import Generator
+from collections.abc import Generator
 
 import pytest
 import pytest_asyncio