software/beremiz-runtime: fix installation of lxml and numpy eggs

See merge request !1328
3 jobs for 1.0
Status Job ID Name Coverage
  External
passed ERP5.StandaloneDeploymentScriptTest-Debian.Buster.Master

failed SlapOS.SoftwareReleases.IntegrationTest-Master

passed SlapOS.Theia.ResilienceTest-Master