mypy: add strict = true

Author: bouwew

pyproject.toml

@@ -203,6 +203,7 @@ disallow_untyped_calls = true
 disallow_untyped_decorators = true
 disallow_untyped_defs = true
 no_implicit_optional = true
+strict = true
 warn_return_any = true
 warn_unreachable = true
 exclude = []