use exclusive fromSequenceNumber in eventsByTag, #22145

* The reason is to have a consistent approach for Sequence and
  TimeBasedUUID, which are both intended as unique event identifiers.
* This means that you can use the offset that is returned in `EventEnvelope`
  as the `offset` parameter in a subsequent query.

akka-docs/rst/java/code/docs/persistence/query/MyEventsByTagJavaPublisher.java

@@ -84,7 +84,7 @@ class MyEventsByTagJavaPublisher extends AbstractActorPublisher<EventEnvelope> {
   private void query() {
     if (buf.isEmpty()) {
       final String query = "SELECT id, persistent_repr " +
-        "FROM journal WHERE tag = ? AND id >= ? " +
+        "FROM journal WHERE tag = ? AND id > ? " +
         "ORDER BY id LIMIT ?";
 
       try (PreparedStatement s = connection.prepareStatement(query)) {