stack/slapos: version up passlib 1.7.4

should fix crypt issues with python 3.9
6 jobs for feat/theia-a2hs
Status Job ID Name Coverage
  External
passed ERP5.StandaloneDeploymentScriptTest-Debian.Buster.Master

failed SlapOS.Eggs.UnitTest-Jerome.Python2

passed SlapOS.Eggs.UnitTest-Jerome.Python3

passed SlapOS.SlapRunner.ResilienceTest-Master

failed SlapOS.SoftwareReleases.IntegrationTest-Master

passed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster.Master