* fix(ux): display actual content type instead of hard-coded application/octet-stream
* feat(ux): show file upload when schema has "format: binary", fixes#5636
* feat(ux): show file upload when schema has "format: base64"
According to
https://github.com/swagger-api/swagger-ui/pull/7325#issuecomment-861684260
the uploaded file should be converted to base64 automatically.
* feat(ux): add cypress tests for displaying an upload button
