/usr/lib/ruby/vendor_ruby/mime/types/image.obsolete is in ruby-mime-types 1.25-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 | *!image/bmp @bmp =use-instead:image/x-bmp
*!image/cmu-raster =use-instead:image/x-cmu-raster
*!image/targa @tga =use-instead:image/x-targa
*!image/vnd.dgn @dgn =use-instead:image/x-vnd.dgn
*!image/vnd.net.fpx =use-instead:image/vnd.net-fpx
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