Fix wrong signature of `safe_open.init` in stub file #851

Job	Run time
Check everything builds & tests (ubuntu-latest, torch==1.10, 3.8)	4m 41s
Check everything builds & tests (ubuntu-latest, torch, 3.12)	5m 42s
Test bigendian - S390X	6m 3s
Check everything builds & tests (macos-13, torch==1.10, 3.8)	6m 38s
Check everything builds & tests (macos-13, torch, 3.12)	10m 6s
Check everything builds & tests (windows-latest, torch==1.10, 3.8)	5m 30s
Check everything builds & tests (windows-latest, torch, 3.12)	6m 42s
	45m 22s

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