uffizi: add /srv/softwareheritage/objects-xfs to backup excludes
uffizi: add /srv/softwareheritage/objects-xfs to backup excludes

SoftwareHeritage/puppet-swh-site,SoftwareHeritage/puppet-swh-site,SoftwareHeritage/puppet-swh-site,SoftwareHeritage/puppet-swh-site,SoftwareHeritage/puppet-swh-site