fix: increase connector retry factor

  - to avoid having the delay going down, the factor must be higher than 1

gravitee-exchange-connector/gravitee-exchange-connector-websocket/src/main/java/io/gravitee/exchange/connector/websocket/WebSocketExchangeConnector.java

@@ -109,7 +109,7 @@ public Completable initialize() {
                     1,
                     300,
                     TimeUnit.SECONDS,
-                    0.5,
+                    1.5,
                     throwable -> throwable instanceof WebSocketConnectorException connectorException && connectorException.isRetryable()
                 )
             )