tests/vm/netbsd: Remove missing py311-expat package

tests/vm/netbsd: Remove missing py311-expat package

Since the pkgsrc-2023Q3 release [*], the py-expat package has been
merged into the base 'python' package:

 - Several packages have been folded into base packages.  While the
   result is simpler, those updating may need to force-remove the
   secondary packages, depending on the update method.  When doing
   make replace, one has to pkg_delete -f the secondary packages.
   pkgin handles at least the python packages correctly, removing the
   split package when updating python.  Specific packages and the
   former packages now included:

     * cairo: cairo-gobject
     * python: py-cElementTree py-curses py-cursespanel py-expat
       py-readline py-sqlite3

Remove py311-expat from the package list in order to avoid:

  ### Installing packages ...
  processing remote summary (http://cdn.NetBSD.org/pub/pkgsrc/packages/NetBSD/amd64/9.3/All)...
  database for http://cdn.NetBSD.org/pub/pkgsrc/packages/NetBSD/amd64/9.3/All is up-to-date
  py311-expat is not available in the repository
  ...
  calculating dependencies.../py311-expat is not available in the repository
  pkg_install error log can be found in /var/db/pkgin/pkg_install-err.log

[*] https://mail-index.netbsd.org/netbsd-announce/2024/01/01/msg000360.html

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2109
Tested-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20240117140746.23511-1-philmd@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>