Add grants_waiting_list_update deadline type (#4544) #3377

Job	Run time
Check backend needs building	14s
Check pretix needs building	11s
Check frontend needs building	10s
Build pretix	-1s
Build backend / Build	2m 31s
Deploy backend	46s
Wait backend deployment	1m 45s
Deploy frontend	44s
Build frontend	0s
Wait frontend deployment	13s
	6m 33s

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