title: Rtk query graphql file upload
body: <p>Doing my first app with redux toolkit and rtk query.</p>
  <p>I have <code>&quot;@rtk-query/graphql-request-base-query&quot;: &quot;^2.1.0&quot;,</code> and <code>&quot;graphql-request&quot;: &quot;^4.2.0&quot;,</code> I get mutations and queries working but cannot figure out how to properly do the file upload. I know how to do with a setup of apollo client but not sure how it should be done here maybe someone has an idea or could give a hint ? the backend expects graphql upload type.</p>