mappings: Bump 'docutils' and 'flake8' python packages on FreeBSD 12 to python 3.9

Peter Kremparequested to merge
pipo.sk/libvirt-ci:freebsd-12-docutils into master

Otherwise libvirt builds on FreeBSD12 fail with:

pkg: No packages available to install matching 'py38-docutils' have been found in the repositories pkg: No packages available to install matching 'py38-flake8' have been found in the repositories

Signed-off-by: Peter Krempa pkrempa@redhat.com

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