I think that file is in the new split package from Network Manager applet.
Code:
Sat Mar 7 20:25:36 UTC 2020
...
xap/libnma-1.8.28-x86_64-1.txz: Added.
This is the NetworkManager GUI client library, which was previously
provided by network-manager-applet. It's now a standalone project, and
is required by network-manager-applet and other NetworkManager frontends.
xap/network-manager-applet-1.16.0-x86_64-1.txz: Upgraded.
This requires the new libnma package.