(OpenAPI) fix BiscuitInfo Role

[ThierryBerger]

          # TODO: (OpenAPI) fix BiscuitInfoRole: swagger editor wants a "schema:" before this line, but vscode highlighter doesn't like it...

https://github.com/Vrixyz/backpack/blob/2a22cb6b0d7e702814e5a1c3f10abe826b0b5a08/crates/server/docs/openapi3_0.yaml#L490