Fix secure file create bug with missing name param

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The Secure File Create API works slightly differently to other file upload endpoints where it also needs a name parameter in the request. This is a breaking change to the function but as it couldn't possibly work anyway that shouldn't be much of a problem.

Error reported on gitlab-org/cli!1994 (closed):

ERROR: Error creating securefile: POST https://gitlab.com/api/v4/projects/:id/secure_files: 400 {error: name is missing}