Java 17 features (itests) (#15583)

- replace Collections by List.of and Set.of
- instanceof
- SAT warnings

Signed-off-by: Holger Friedrich <mail@holger-friedrich.de>

itests/org.openhab.binding.mqtt.ruuvigateway.tests/src/main/java/org/openhab/binding/mqtt/ruuvigateway/RuuviGatewayTest.java

@@ -385,9 +385,15 @@ public class RuuviGatewayTest extends MqttOSGiTest {
         } else {
             // test argument is only specifiying the data field in the json payload
             // Fill rest of the fields with some valid values
-            jsonPayload = "{" + "  \"gw_mac\": \"DE:AD:BE:EF:00\"," + "  \"rssi\": -82," + "  \"aoa\": [],"
-                    + "  \"gwts\": \"1659365432\"," + "  \"ts\": \"1659365222\"," + "  \"data\": \"" + val + "\","
-                    + "  \"coords\": \"\" }";
+            jsonPayload = """
+                    {\
+                      "gw_mac": "DE:AD:BE:EF:00",\
+                      "rssi": -82,\
+                      "aoa": [],\
+                      "gwts": "1659365432",\
+                      "ts": "1659365222",\
+                      "data": "\
+                    """ + val + "\"," + "  \"coords\": \"\" }";
         }
 
         Thing ruuviThing = createRuuviThing("mygwid", topic, 100);
@@ -525,7 +531,6 @@ public class RuuviGatewayTest extends MqttOSGiTest {
                         .forEach(channelId -> assertEquals(UnDefType.UNDEF, getItemState.apply(channelId)));
                 statusUpdateIndex.incrementAndGet();
             });
-
         }
 
         // Another mqtt update (("minimum values" test vector from

itests/org.openhab.binding.mqtt.ruuvigateway.tests/src/main/java/org/openhab/binding/mqtt/ruuvigateway/ThingStatusInfoChangedSubscriber.java

@@ -14,7 +14,6 @@ package org.openhab.binding.mqtt.ruuvigateway;
 
 import static org.junit.jupiter.api.Assertions.assertInstanceOf;
 
-import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -48,7 +47,7 @@ public class ThingStatusInfoChangedSubscriber implements EventSubscriber {
 
     @Override
     public Set<@NonNull String> getSubscribedEventTypes() {
-        return Collections.singleton(ThingStatusInfoChangedEvent.TYPE);
+        return Set.of(ThingStatusInfoChangedEvent.TYPE);
     }
 
     @Override