The neutron-distgit validation is failing for Centos9 using the Neutron master branch.

In [1] Neutron introduced a change incompatible with python 3.9.

• Patch: https://review.rdoproject.org/r/c/openstack/neutron-distgit/+/57690
• Logs: https://logserver.rdoproject.org/db5/rdoproject.org/db58bb5b4eca450da2e5f03eb08ef318/job-output.txt
• Snippet: https://paste.opendev.org/show/bkpK3unatstvesVt2iXU/

[1]https://opendev.org/openstack/neutron/commit/2da8cc64b5bad74acf28f798c67fdaff04b2d3b9