Fix the bug DS-1857

The batch import would terminate the tomcat running DSpace 4.0, if the file the user was trying to upload did not conform to the format defined in the BTE spring configuration. For instance if the configuration expected 5 columns when uploading a CSV, but only 4 existed actually in the file the CSVDataLoader would throw an Exception that would eventually execute a System.exit(1).

This PR, fixes this bug, and updates the dependencies to the latest BTE version.

Relevant jira issue: https://jira.duraspace.org/browse/DS-1857