tests: Disable F39 RPM test because of pytest+xdist bug

F39 pip isn't affected, but on rpm the tests stuck
till the OOM Killer triggers. There are multiple
similar reports upstream but no fix. To unblock
the unit tests, F39 RPM will be skipped for now.
F39 pip covers py39, py310, py311 and py312.

CI jobs that run into the issue:
https://jenkins-pagure.apps.ocp.cloud.ci.centos.org/job/pull-requests/276/
https://jenkins-pagure.apps.ocp.cloud.ci.centos.org/job/pull-requests/277/

GitHub issues that report similar issues:
pytest-dev/pytest-xdist#110
pytest-dev/pytest-xdist#661
pytest-dev/pytest-xdist#872
pytest-dev/pytest-xdist#1005

dev/containers/fedora-rpms-py3

@@ -41,5 +41,5 @@ RUN dnf install -y --enablerepo=updates-testing `grep "Requires:" /pagure/files/
     python3 setup.py build
 
 WORKDIR /pagure
-ENTRYPOINT ["/pagure/dev/containers/runtests_py3.sh"]
+ENTRYPOINT ["/bin/sh", "-c", "echo F39 RPM SKIPPED - Bug with pytest+xdist, tests stuck and trigger OOM Killer - see https://pagure.io/pagure/pull-request/5463"]
 CMD []