Update python-azure-core to version 1.21.0 / rev 21 via SR 937768
https://build.opensuse.org/request/show/937768
by user rjschwei + dimstar_suse
- New upstream release
+ Version 1.21.0
+ For detailed information about changes see the
CHANGELOG.md file provided with this package (forwarded request 937718 from glaubitz)