Pin Flask version for connexion #83

Job	Run time
test (3.7)	21s
test (3.8)	24s
test (3.9)	17s
test (3.10)	20s
test (3.11)	16s
integration (gunicorn)	19s
integration (gunicorn-internal)	13s
integration (gunicorn-app-factory)	15s
integration (uwsgi)	40s
integration (uwsgi-lazy-apps)	33s
integration (wsgi)	22s
integration (connexion-pydantic)	20s
integration (restful-with-blueprints)	15s
integration (restful-return-none)	20s
integration (restplus-default-metrics)	14s
integration (flask-httpauth)	24s
integration (flask-multi-processes)	13s
integration (reload)	14s
publish	0s
verify	0s
	6m 0s

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