Fix liquibase test failing

The idea of the liquibase test script is as follows (for e.g. current release 15.0):

1. Test detects that current catalogue version is 15.0
2. Checks that there is a migration script from 14.0 to 15.0 (or rarely from a previous version, if 14.0 was deprecated)
3. Sets up a catalogue instance with Version 14.0
4. Verifies if it is 14.0 and correct
5. Applies the migration script from 14.0 to 15.0
6. Verifies if it is 15.0 and correct
7. Rollback the migration script from 15.0 to 14.0

However, at the moment the tests are failing at step 4: the actual version is 15.0, while the expected version 14.0. Clearly, something is going wrong with step 3, because the catalogue instance has version 15.0.

This should be fixed, because the scheduled pipeline on this now keeps failing.