Rename row_of_bytes to row_of_u32 since that's what it contains now
Rename row_of_bytes to row_of_u32 since that's what it contains now

Part-of: <https://gitlab.gnome.org/GNOME/librsvg/-/merge_requests/671>

GNOME/librsvg,GNOME/librsvg,GNOME/librsvg,GNOME/librsvg