The <jdbcconfiguration> tag does not support the configurationFile property any more.
With hibernate-tools 5.2.12 this is still working, but not with 5.4.12.

Apparently the code has been restructured. configurationFile is evaluated in the ConfigurationTask.createMetadataDescriptor (or rather forwarded to the respective factory).
But JDBCConfigurationTask overrides the createMetadataDescriptor method and only explicitly handles the propertyFile property via loadPropertiesFile().
configurationFile is completely ignored.

Please reenable configuring the <jdbcconfiguration> task with an XML configuration.