attempt to fix sparta pyyaml issue by locking pyyaml version to 5.x series, instead of new default 6; work on #1750
attempt to fix sparta pyyaml issue by locking pyyaml version to 5.x series, instead of new default 6; work on #1750

geneontology/go-site,geneontology/go-site,geneontology/go-site,geneontology/go-site,geneontology/go-site