pipfile: upgrade to python 3.9

Pipfile

@@ -4,29 +4,29 @@ verify_ssl = true
 name = "pypi"
 
 [packages]
-bcrypt = "==3.1.7"
+bcrypt = "==3.2.0"
 itsdangerous = "==1.1.0"
-asyncpg = "==0.20.1"
+asyncpg = "==0.23.0"
 websockets = "==8.1"
 Earl-ETF = "==2.1.2"
 logbook = "==1.5.3"
-Cerberus = "==1.3.2"
+Cerberus = "==1.3.4"
 quart = "==0.12.0"
 pillow = "*"
-aiohttp = "==3.6.2"
+aiohttp = "==3.7.4"
 zstandard = "*"
 winter = {editable = true,git = "https://gitlab.com/elixire/winter.git"}
 
 [dev-packages]
-pytest = "==5.4.3"
-pytest-asyncio = "==0.12.0"
+pytest = "==6.2.4"
+pytest-asyncio = "==0.15.1"
 mypy = "*"
 black = "*"
 flake8 = "*"
 pyflakes = "*"
 
 [requires]
-python_version = "3.8"
+python_version = "3.9"
 
 [pipenv]
 allow_prereleases = true