/usr/lib/mime/packages/groff-base is in groff-base 1.22.2-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | application/x-troff-man; /usr/bin/nroff -mandoc -Tutf8; copiousoutput; print=/usr/bin/nroff -mandoc -Tutf8 | print text/plain:-
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