fix failing stubtest

Author: jswhit2

src/netCDF4/__init__.pyi

@@ -385,13 +385,13 @@ class Dataset:
     def has_zstd_filter(self) -> bool: ...
     def has_bzip2_filter(self) -> bool: ...
     def has_szip_filter(self) -> bool: ...
-    def __getitem__(self, elem: str) -> Any: ...  # should be Group | Variable, but this causes too many problems
+    def __getitem__(self, elem: str, /) -> Any: ...  # should be Group | Variable, but this causes too many problems
     # __iter__ and __contains__ always error because iteration and membership ops are not allowed
     def __iter__(self) -> NoReturn: ...
     def __contains__(self, key) -> NoReturn: ...
-    def __setattr__(self, name: str, value: Any) -> None: ...
-    def __getattr__(self, name: str) -> Any: ...
-    def __delattr__(self, name: str): ...
+    def __setattr__(self, name: str, value: Any, /) -> None: ...
+    def __getattr__(self, name: str, /) -> Any: ...
+    def __delattr__(self, name: str, /): ...
     def __reduce__(self) -> NoReturn: ...
     def __enter__(self) -> Self: ...
     def __exit__(self, atype, value, traceback) -> None: ...
@@ -585,11 +585,11 @@ class Variable(Generic[VarT]):
     def set_ncstring_attrs(self, ncstring_attrs: bool) -> None: ...
     def set_collective(self, value: bool) -> None: ...
     def get_dims(self) -> tuple[Dimension, ...]: ...
-    def __delattr__(self, name: str) -> None: ...
-    def __setattr__(self, name: str, value: Any) -> None: ...
-    def __getattr__(self, name: str) -> Any: ...
-    def __getitem__(self, elem: Any) -> Any: ...
-    def __setitem__(self, elem: Any, data: npt.ArrayLike) -> None: ...
+    def __delattr__(self, name: str, /) -> None: ...
+    def __setattr__(self, name: str, value: Any, /) -> None: ...
+    def __getattr__(self, name: str, /) -> Any: ...
+    def __getitem__(self, elem: Any, /) -> Any: ...
+    def __setitem__(self, elem: Any, data: npt.ArrayLike, /) -> None: ...
     def __array__(self) -> np.ndarray: ...
     def __len__(self) -> int: ...
     def __iter__(self) -> Iterator[Any]: ...  # faux method so mypy believes Variable is iterable