We are observing mariadb crashes in ERP5 with 10.4, so revert back to 10.3

Crashes errors are:

    InnoDB: Assertion failure in file .../mariadb-10.4.14/storage/innobase/lock/lock0lock.cc line 6900

in non debug mode and:

    mysqld: .../mariadb-10.4.14/storage/innobase/row/row0sel.cc:4480: dberr_t row_search_mvcc(byte*, page_cur_mode_t, row_prebuilt_t*, ulint, ulint): Assertion `prebuilt->sql_stat_start || trx->state == TRX_STATE_ACTIVE || (prebuilt->table->no_rollback() && trx->state == TRX_STATE_NOT_STARTED)' failed.

in debug mode.

This is an incompatible change for ERP5 instances which might have
already been running mariadb 10.4, because their database would have
been updated to 10.4, but mariadb does not support "downgrading".
Hopefully we don't have such cases, but if that's the case one
solution seems to dump databases with 10.4 and load in 10.3 and
I guess in this process the system databases such as "mysql" should
be excluded from this process.