Remove empty __init__ methods (#8816)

stdlib/csv.pyi

@@ -146,6 +146,5 @@ class DictWriter(Generic[_T]):
 
 class Sniffer:
     preferred: list[str]
-    def __init__(self) -> None: ...
     def sniff(self, sample: str, delimiters: str | None = ...) -> type[Dialect]: ...
     def has_header(self, sample: str) -> bool: ...