component/mariadb: use 10.4 (and drop 10.3)

We use to stick with 10.3 because of crashes with ERP5, but with 10.4.28
we don't have crashes anymore.

See https://jira.mariadb.org/browse/MDEV-23939 for the upstream bug and
!817 for a
reproduction in ERP5.
42 jobs for feat/mariadb-10.4 in 0 seconds (queued for 3 seconds)
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running ERP5.UnitTest-Mariadb-10.4

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failed ERP5.UnitTest-Mariadb-10.4

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