MariaDB Java Client 3.0.3 - Java batched statements with optimistic locking failing

Hi, I'm the author of JobRunr (https://github.com/jobrunr/jobrunr), a distributed job scheduler for Java.

JobRunr supports quite a lot of SQL databases and after the upgrade to `org.mariadb.jdbc:mariadb-java-client:3.0.3`, none of the batched insert & update statements work anymore.

These worked fine with all prior mariadb-java-clients and the same code also works fine for MySQL, Postgres, ... .

How to reproduce:

• git clone https://github.com/jobrunr/jobrunr.git
• cd jobrunr && git checkout feature/v5
• git grep -l 'mariadb-java-client:2.7.5' | xargs sed -i '' -e 's/2\.7\.5/3.0.3/g'
• ./gradlew build