Bump pytest from 4.6.11 to 6.2.1 (#7)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

poetry.lock

@@ -22,7 +22,7 @@ aiohttp = "^3.7.3"
 pyhumps = "^1.6.1"
 
 [tool.poetry.dev-dependencies]
-pytest = "^4.6"
+pytest = "^6.2"
 pre-commit = "^2.9.3"
 black = "^20.8b1"
 pylint = "^2.6.0"