[cffi] Fix a few argument types for C code (#13661)

* CLibrary.close_lib() doesn't take any arguments.
* FFI.typeof() only takes positional arguments.

Author: srittau

stubs/cffi/_cffi_backend.pyi

@@ -34,7 +34,7 @@ class CField:
 
 @final
 class CLibrary:
-    def close_lib(self, *args, **kwargs): ...
+    def close_lib(self) -> None: ...
     def load_function(self, *args, **kwargs): ...
     def read_variable(self, *args, **kwargs): ...
     def write_variable(self, *args, **kwargs): ...
@@ -204,7 +204,7 @@ class FFI:
     def release(self, cdata: CData, /) -> None: ...
     def sizeof(self, cdecl: str | CType | CData, /) -> int: ...
     def string(self, cdata: CData, maxlen: int = -1) -> bytes | str: ...
-    def typeof(self, cdecl: str | CData) -> CType: ...
+    def typeof(self, cdecl: str | CData, /) -> CType: ...
     def unpack(self, cdata: CData, length: int) -> bytes | str | list[Any]: ...
 
 def alignof(cdecl: CType, /) -> int: ...