mariadb: update MDEV-20693 mixin for versions 10.3 & 10.4

It was broken since commit 92779bf4.
16 jobs for master in 0 seconds
Status Job ID Name Coverage
  External
passed SlapOS.Eggs.UnitTest-Master.Python2

passed SlapOS.Eggs.UnitTest-Master.Python3

passed SlapOS.SlapRunner.ResilienceTest-Master

00:24:28

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

00:30:10

failed SlapOS.SoftwareReleases.IntegrationTest-Master.Python2

06:02:08

passed SlapOS.SoftwareReleases.IntegrationTest-Master.Python3

03:55:34

failed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster.Master

14:06:50

passed SlapOS.Eggs.UnitTest-Master.Python2

passed SlapOS.Eggs.UnitTest-Master.Python2

00:09:42

passed SlapOS.Eggs.UnitTest-Master.Python2

passed SlapOS.Eggs.UnitTest-Master.Python2

00:08:48

passed SlapOS.Eggs.UnitTest-Master.Python3

00:09:15

passed SlapOS.Eggs.UnitTest-Master.Python3

00:32:25

passed SlapOS.SlapRunner.ResilienceTest-Master

00:25:31

failed SlapOS.SlapRunner.ResilienceTest-Master.ERP5

00:25:14

passed Wendelin.StandaloneDeploymentScriptTest-Debian.Buster.Master

13:11:48