io.debezium.connector.postgresql.PostgisGeometry shouldn't use DatatypeConverter

The DatatypeConverter class is part of the javax.xml.bind module, which isn't resolved by default in Java 9/10 and which isn't part of the JDK at all as of 11 and later. This means using the connector is more cumbersome on Java 9 and later, as the module must be either enabled or even added as a separate JAR.