Update python-dunamai to version 1.21.2 / rev 6 via SR 1183716
https://build.opensuse.org/request/show/1183716
by user rrahl0 + anag+factory
- update to 1.21.2:
* Fixed: Some timestamps could fail to parse on Python 3.5 and 3.6. (forwarded request 1183715 from rrahl0)