stack/erp5: backport Products.MimetypesRegistry PR for classify on py3

Status Job ID Name Coverage
  External
passed Cloudooo.UnitTest-Master

00:13:02

running ERP5.CodingStyleTest-Zope4Py3

1389:05:13

running ERP5.CodingStyleTest-Zope4Py3-py2

1388:45:59

passed ERP5.StandaloneDeploymentScriptTest-Debian.Buster

00:39:20

running ERP5.UnitTest-Zope4Py3

1390:22:06

passed SlapOS.Eggs.UnitTest-Master.Python2

00:25:34

passed SlapOS.Eggs.UnitTest-Master.Python3

00:25:46

failed SlapOS.SoftwareReleases.IntegrationTest-Master

13:45:32

passed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster

00:38:31