ci: Fix mypy, gevent #3306

Job	Run time
Gevent (pinned) (3.6, ubuntu-22.04)	3m 52s
Gevent (pinned) (3.11, ubuntu-22.04)	4m 58s
Gevent (pinned) (3.10, ubuntu-22.04)	4m 34s
Gevent (pinned) (3.8, ubuntu-22.04)	6m 18s
Gevent (pinned) (3.12, ubuntu-22.04)	5m 34s
All pinned Gevent tests passed	2s
	25m 18s

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