Fix unsupportedPlatformValueLeavesPlatformsNull test

Author: srnyx

src/test/java/gg/eventalerts/eventalertsintegration/objects/EventJsonTest.java

@@ -101,6 +101,6 @@ void unsupportedPlatformValueLeavesPlatformsNull() {
 
         final Event event = GSONProvider.GSON.fromJson(json, Event.class);
 
-        assertNull(event.platforms);
+        assertEquals(Set.of(Event.Platform.JAVA), event.platforms);
     }
 }