Bump dependencies (#874)

* fix pytest-asynio bump to 0.19

* bump mypy

* fix coverage of async fixtures

tests/test_queries/test_selecting_subset_of_columns.py

@@ -5,6 +5,7 @@ from typing import Optional, List
 import databases
 import pydantic
 import pytest
+import pytest_asyncio
 import sqlalchemy
 
 import ormar
@@ -86,7 +87,7 @@ def event_loop():
     loop.close()
 
 
-@pytest.fixture(autouse=True, scope="module")
+@pytest_asyncio.fixture(autouse=True, scope="module")
 async def sample_data(event_loop, create_test_database):
     async with database:
         nick1 = await NickNames.objects.create(name="Nippon", is_lame=False)