community/ruby-mathematical: upgrade to 1.6.20
https://github.com/gjtorikian/mathematical/releases/tag/v1.6.20
Fixes -Wint-conversion
errors with gcc 14.
Edited by mio
https://github.com/gjtorikian/mathematical/releases/tag/v1.6.20
Fixes -Wint-conversion
errors with gcc 14.