Update requirements.txt

[vincent-pli]

Hi the issue with openshift 4.8

2022-03-09T21:21:09.838813134Z Error: Bad module 'app'
2022-03-09T21:21:09.838813134Z
2022-03-09T21:21:09.838813134Z Usage:
2022-03-09T21:21:09.838813134Z
2022-03-09T21:21:09.838813134Z     waitress-serve [OPTS] MODULE:OBJECT
2022-03-09T21:21:09.838813134Z
2022-03-09T21:21:09.838813134Z Standard options:
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2022-03-09T21:21:09.838813134Z     --help
2022-03-09T21:21:09.838813134Z         Show this information.
2022-03-09T21:21:09.838813134Z
2022-03-09T21:21:09.838813134Z     --call
2022-03-09T21:21:09.838813134Z         Call the given object to get the WSGI application.
2022-03-09T21:21:09.838813134Z
2022-03-09T21:21:09.838813134Z     --host=ADDR
[snip]
2022-03-09T21:21:09.838813134Z
2022-03-09T21:21:09.838813134Z There was an exception (ImportError) importing your module.
2022-03-09T21:21:09.838813134Z
2022-03-09T21:21:09.838813134Z It had these arguments:
2022-03-09T21:21:09.839000767Z 1. cannot import name 'json' from 'itsdangerous' (/usr/local/lib/python3.10/site-packages/itsdangerous/__init__.py)