The wheel was built from a0e11118, the first commit on #13816. The PR
has grown since then: initial values now go through
move_files_to_cache, and a value that comes back as an input no longer
reaches _upload_file as a local path. Both are visible here, so point
at d77f9283 and check three markers instead of one.
Pin sdk_version to 6.26.0. PyPI has moved to 6.27.0, and without the
pin the requirement Spaces appends would install a released gradio
over the preview wheel.
