Bump pytest from 6.1.1 to 6.1.2 (#384)

Author: dependabot-preview[bot]

requirements-dev.txt

@@ -5,7 +5,7 @@ sphinx==3.2.1
 alabaster>=0.6.2
 aiohttp==3.6.3
 jinja2==2.11.2
-pytest==6.1.1
+pytest==6.1.2
 pytest-cov==2.10.1
 yarl==1.6.0
 multidict==5.0.0