Adjust outbox extension to updated Quarkus semantics

From mkouba@redhat.com on quarkus-dev:

Martin Kouba: hey @Gunnar Morling , just remove the setter method: https://github.com/debezium/debezium/blob/bf539c352af69df008ee06b66cfc2b5ac6f124d3/debezium-quarkus-outbox/runtime/src/main/java/io/debezium/outbox/quarkus/internal/EventDispatcher.java#L48-L50

Martin Kouba: and add @Inject here: https://github.com/debezium/debezium/blob/bf539c352af69df008ee06b66cfc2b5ac6f124d3/debezium-quarkus-outbox/runtime/src/main/java/io/debezium/outbox/quarkus/internal/EventDispatcher.java#L41