Add python3-networkx to AppStream.
Merge upstream commit 2266a6218ae7f2b095a55aeef57bc6f3c5053e5b:
RHEL-8.2.0: Add python-networkx to AppStream (RhBug 1764287) (RCM-68861)
Change-Id: I45bf9882833d16b064d050e1965f5670a4a9ca41
Jira: RCM-68861
Merge upstream commit 9ba3fef3f26596f43fd93432351c0de11c2f2e15:
Fix correct name of python3-networkx package
Change-Id: Ibed51e6e9ce873fdcd8f53184415acc978cdd36b
Jira: RCM-71386