erp5/upgrade_test: update old software release with postfix disabled

see bd1b1928 (component/postfix: disable build on Linux >= 5, 2021-04-08)
4 jobs for fix/erp5-upgrade-test-postfix in 0 seconds
Status Job ID Name Coverage
  External
failed SlapOS.SoftwareReleases.IntegrationTest-Jerome-WIP

07:38:46

canceled SlapOS.SoftwareReleases.IntegrationTest-Jerome-WIP

14:25:25

failed SlapOS.SoftwareReleases.IntegrationTest-Jerome-WIP

07:15:02

failed SlapOS.SoftwareReleases.IntegrationTest-Jerome-WIP

09:04:54