fix(files): make `ref` parameter optional in get raw file api

        self.gitlab.http_delete(path, query_data=data, **kwargs)

    @cli.register_custom_action(

        cls_names="ProjectFileManager", required=("file_path", "ref")

        cls_names="ProjectFileManager",

        required=("file_path",),

    )

    @exc.on_http_error(exc.GitlabGetError)

    def raw(

        self,

        file_path: str,

        ref: str,

        ref: Optional[str] = None,

        streamed: bool = False,

        action: Optional[Callable[..., Any]] = None,

        chunk_size: int = 1024,

        """Return the content of a file for a commit.

        Args:

            ref: ID of the commit

            file_path: Path of the file to return

            ref: ID of the commit

            streamed: If True the data will be processed by chunks of

                `chunk_size` and each chunk is passed to `action` for

                treatment

            iterator: If True directly return the underlying response

                iterator

            action: Callable responsible of dealing with chunk of

            action: Callable responsible for dealing with each chunk of

                data

            chunk_size: Size of each chunk

            iterator: If True directly return the underlying response

                iterator

            **kwargs: Extra options to send to the server (e.g. sudo)

        Raises:

        """

        file_path = utils.EncodedId(file_path)

        path = f"{self.path}/{file_path}/raw"

        if ref:

            query_data = {"ref": ref}

        else:

            query_data = None

        result = self.gitlab.http_get(

            path, query_data=query_data, streamed=streamed, raw=True, **kwargs

        )