Update Pretix to v2025.9.0 (#4492) #3331

Job	Run time
Check backend needs building	10s
Check pretix needs building	9s
Check frontend needs building	12s
Build pretix / Build pretix	1m 47s
Build backend	0s
Deploy backend	38s
Wait backend deployment	11s
Deploy frontend	43s
Build frontend	-1s
Wait frontend deployment	11s
	4m 0s

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