Python 3.11 support problems

[eclipseo]

Building rfpkg on Python 3.11 fails with the following error:

+ /usr/bin/python3 doc/rfpkg_man_page.py
Traceback (most recent call last):
  File "/builddir/build/BUILD/rfpkg-1.27.0/doc/rfpkg_man_page.py", line 24, in <module>
    client = rfpkg.cli.rfpkgClient(config=config, name='rfpkg')
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/builddir/build/BUILD/rfpkg-1.27.0/rfpkg/cli.py", line 37, in __init__
    self.setup_fed_subparsers()
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/builddir/build/BUILD/rfpkg-1.27.0/rfpkg/cli.py", line 54, in setup_fed_subparsers
    self.register_retire()
    ^^^^^^^^^^^^^^^^^^^^^^
  File "/builddir/build/BUILD/rfpkg-1.27.0/rfpkg/cli.py", line 64, in register_retire
    retire_parser = self.subparsers.add_parser(
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.11/argparse.py", line 1185, in add_parser
    raise ArgumentError(self, _('conflicting subparser: %s') % name)
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
argparse.ArgumentError: argument {help,build,chain-build,clean,clog,clone,co,copr-build,commit,ci,compile,container-build,container-build-setup,diff,flatpak-build,gimmespec,gitbuildhash,gitcred,giturl,import,install,lint,list-side-tags,local,mockbuild,mock-config,module-build,module-scratch-build,module-build-cancel,module-build-info,module-build-local,module-build-watch,module-overview,new,new-sources,patch,prep,pull,push,remote,remove-side-tag,request-side-tag,retire,scratch-build,sources,srpm,switch-branch,tag,unused-patches,upload,verify-files,verrel}: conflicting subparser: retire

It is because of this change in Python 3.11

python/cpython#83897
python/cpython#18605