GNOME 48 switched to new Inter and Iosevka based Adwaita fonts: 067cb4b155 https://blogs.gnome.org/monster/introducing-adwaita-fonts/ The default fonts were last changed to Cantarell and Source Code Pro in GNOME 3.32: 965062de47 Source Sans was added alongside them in c99a666aac but it does not seem to be needed nowadays. The only relevant package mentioning it according is GNOME Recipes: https://codesearch.debian.net/search?q=Source+Sans+-pkg%3Atexlive+-pkg%3Aopenjdk+-pkg%3Abootswatch+-pkg%3Aqt%28%5Cd-%29%3Fwebengine+-pkg%3Afirefox+-pkg%3Ar-cran+-pkg%3Ataskflow+-pkg%3Afonts-adobe-sourcesans+-path%3Asvg%24+-path%3A%2Fdoc%2F+-path%3A%2Fdocs%2F&literal=1 DejaVu fonts are meant as a generic fallback but they are already pulled in by `fonts.enableDefaultPackages` option.
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