turn off pre-release for 8.7.9 release branch
turn off pre-release for 8.7.9 release branch

htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor