Added PomBase cross reference
Added PomBase cross reference

as per https://github.com/geneontology/go-ontology/issues/12602
geneontology/go-site,hattrill/go-site,geneontology/go-site,geneontology/go-site,hattrill/go-site,hattrill/go-site,geneontology/go-site,hattrill/go-site,hattrill/go-site,geneontology/go-site