Update deepin-polkit-agent to version 5.5.21 / rev 5 via SR 1000253
https://build.opensuse.org/request/show/1000253
by user hillwood + dimstar_suse
- Update version to 5.5.21
* Fix bugs
- Drop polkit-qt5.patch, merged
- Update version to 5.5.19
* Fix bugs
* Update translations