Update librsvg to version 2.50.7 / rev 109 via SR 898026
    
    https://build.opensuse.org/request/show/898026
    by user dimstar + dimstar_suse
    - Update to version 2.50.7:
      + Two cairo-related bug fixes:
        - glgo#GNOME/librsvg#745: Fix mismatched cairo_save/restore
          when running in inside the Cairo test suite.
        - glgo#GNOME/librsvg#746: Possible cairo_save() without
          cairo_restore() in render_layer(). (forwarded request 897672 from iznogood)