/usr/lib/ruby/vendor_ruby/mime/types/text.obsolete is in ruby-mime-types 1.25-2.
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 6 7 8 | !text/directory 'IANA,RFC2425,RFC6350
!text/ecmascript 'IANA,RFC4329
!text/javascript @js 'IANA,RFC4329
!text/x-rtf @rtf :8bit =use-instead:text/rtf
!text/x-vnd.flatland.3dml =use-instead:model/vnd.flatland.3dml
*!text/comma-separated-values @csv :8bit =use-instead:text/csv
*!text/vnd.flatland.3dml =use-instead:model/vnd.flatland.3dml
!text/vnd.si.uricatalogue 'IANA,[Parks Young=ParksYoung]
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