Update python-meson-python to version 0.12.1 / rev 6 via SR 1074506
https://build.opensuse.org/request/show/1074506
by user dirkmueller + dimstar_suse
- update to 0.12.1:
* Fix regression where the ``MACOSX_DEPLOYMENT_TARGET``
environment variable was accidentally renamed to
``MACOS_DEPLOYMENT_TARGET``