graphics/librsvg2-rust: Update to 2.60.0

• Upstream switched to Meson

Changelog: https://gitlab.gnome.org/GNOME/librsvg/-/releases/2.60.0

Thanks to mikael@ and fluffy@ for testing and suggesting fixes
including for consumers

PR: 284977
Tested by: fluffy
Approved by: desktop (vishwin (previous version), fluffy)