Update librsvg to version 2.50.3 / rev 105 via SR 867679
https://build.opensuse.org/request/show/867679
by user dimstar + dimstar_suse
- Update to version 2.50.3:
+ Compute correct bounds for objects with stroke-width=0.
+ Fix test suite on Rust 1.49. (forwarded request 867565 from iznogood)