Update pytest asyncio

Author: linuxdaemon

requirements-dev.txt

@@ -1,10 +1,10 @@
 coverage == 6.1.2
 freezegun == 1.1.0
-mypy ~= 0.910
+mypy == 0.910
 pre-commit == 2.17.0
 pylint == 2.11.1
 pytest == 6.2.5
-pytest-asyncio == 0.16.0
+pytest-asyncio == 0.20.3
 pytest-cov == 3.0.0
 pytest-random-order == 1.0.4
 responses == 0.16.0