Update pytest and pytest-aiohttp

Newer pytest requires a plugin to run async test functions.
pytest-asyncio will be installed as a dependency of newer
pytest-aiohttp, but the tests aren't automatically marked for use with
pytest-asyncio. Explicitly add pytest-asyncio and configure it for auto
mode[1] so it does that.

1. https://pytest-asyncio.readthedocs.io/en/latest/concepts.html#auto-mode

Pipfile

@@ -9,8 +9,9 @@ flake8 = "*"
 flake8-bugbear = "*"
 freezegun = "*"
 mypy = ">=0.720, < 0.920"
-pytest = "~= 6.2"
-pytest-aiohttp = "~= 0.3"
+pytest = "*"
+pytest-aiohttp = "*"
+pytest-asyncio = "*"
 pytest-cov = "*"
 types-toml = "*"
 

setup.cfg

@@ -50,6 +50,7 @@ warn_unused_ignores = True
 disallow_untyped_defs = False
 
 [tool:pytest]
+asyncio_mode = auto
 filterwarnings =
     error::DeprecationWarning:azafea_metrics_proxy.*
     ignore::DeprecationWarning:distutils.*