Update librsvg to 2.63.0 from 2.60.0 - #806

buildx failed with: ERROR: failed to build: failed to solve: process "/bin/sh -c wget $WGET_OPTS -O librsvg.tar.xz \"$LIBRSVG_URL\" && echo \"$LIBRSVG_SHA256 librsvg.tar.xz\" | sha256sum --status -c - && tar $TAR_OPTS librsvg.tar.xz && cd librsvg-* && sed -i \"/^if host_system in \\['windows'/s/, 'linux'//\" meson.build && meson setup build -Dbuildtype=release -Ddefault_library=static -Ddocs=disabled -Dintrospection=disabled -Dpixbuf=disabled -Dpixbuf-loader=disabled -Dvala=disabled -Dtests=false && ninja -j$(nproc) -vC build install" did not complete successfully: exit code: 8