Update python-osc-tiny to version 0.6.6 / rev 19 via SR 993539
https://build.opensuse.org/request/show/993539
by user mcepl + dimstar_suse
- Buildrequires cached-property always, not only for Python lower than 3.8
* This is needed due to a mismatching python-rpm-macros
- Fix conditional Requires and BuildRequires.