component/proftpd: update source repository for proftpd/mod_auth_web

This repository from the source of the pull request was removed, let's use a
local copy for now.
8 jobs for feat/theia-version-up in 0 seconds
Status Job ID Name Coverage
  External
passed SlapOS.SlapRunner.ResilienceTest-Master

00:24:51

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

00:17:37

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python2

06:28:06

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python3

04:49:09

passed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster.Master

06:47:06

passed SlapOS.SlapRunner.ResilienceTest-Master

00:24:39

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

00:24:46

passed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster.Master

05:51:31