The package needs to be rebuilt to update dependencies, let's use this opportunity to fix the URL as well. libsigc++3 has the same issue.
libsigc++3-2.99.12-alt1.1 -> sisyphus: Sat Mar 09 2019 Yuri N. Sedunov <aris@altlinux> 2.99.12-alt1.1 - fixed %url (ALT #36250)