[config] Test dependency ruamel.yaml.clib needs to be updated for Python 3.10

[Dariusz Smigiel]

When trying to run tests on Python 3.10, tox showed errors.

    Building wheels for collected packages: ruamel.yaml.clib
      Building wheel for ruamel.yaml.clib (setup.py): started
      Building wheel for ruamel.yaml.clib (setup.py): finished with status 'error'
      Running setup.py clean for ruamel.yaml.clib
    Failed to build ruamel.yaml.clib
 ...
    ERROR: Command errored out with exit status 1: /tmp/.venv/bin/python -u -c 'import io, os, sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-7w80o_ed/ruamel-yaml-clib_8898227f428642abacf4e69ca73094ab/setup.py'"'"'; __file__='"'"'/tmp/pip-install-7w80o_ed/ruamel-yaml-clib_8898227f428642abacf4e69ca73094ab/setup.py'"'"';f = getattr(tokenize, '"'"'open'"'"', open)(__file__) if os.path.exists(__file__) else io.StringIO('"'"'from setuptools import setup; setup()'"'"');code = f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /tmp/pip-record-uej0f1dn/install-record.txt --single-version-externally-managed --compile --install-headers /tmp/.venv/include/site/python3.10/ruamel.yaml.clib Check the logs for full command output.

I tracked them down to issues with pinned version of ruamel.yaml.clib

[dasm@fedora config]$ cat test-requirements.txt | grep ruamel
ruamel.yaml.clib==0.2.2

After swapping version to latest released one for ruamel.yaml.clib 0.2.6 it resolved issues.
The author of the package has been notified about the issue with compilation [1], and updated code to incorporate changes.
Additionally, the Author suggested use of newer version of ruamel.yaml altogether with ruamel.yaml.clib to support Python 3.10 [2]

[1]: https://sourceforge.net/p/ruamel-yaml-clib/tickets/5/
[2]: https://sourceforge.net/p/ruamel-yaml-clib/tickets/7/