Disable another unstable test (#18068)

Related to #12667

Signed-off-by: Jacob Laursen <jacob-github@vindvejr.dk>

itests/org.openhab.binding.mqtt.homie.tests/src/main/java/org/openhab/binding/mqtt/homie/HomieImplementationTest.java

@@ -165,6 +165,7 @@ public class HomieImplementationTest extends MqttOSGiTest {
                 "Connection " + homieConnection.getClientId() + " not retrieving all topics ");
     }
 
+    @Disabled("https://github.com/openhab/openhab-addons/issues/12667")
     @Test
     public void retrieveOneAttribute() throws Exception {
         WaitForTopicValue watcher = new WaitForTopicValue(homieConnection, DEVICE_TOPIC + "/$homie");