Migrate tests to JUnit 5 (#8519)

Signed-off-by: Wouter Born <github@maindrain.net>

bundles/org.openhab.binding.wifiled/src/test/java/org/openhab/binding/wifiled/internal/handler/LEDStateDTOTest.java

@@ -13,9 +13,9 @@
 package org.openhab.binding.wifiled.internal.handler;
 
 import static org.hamcrest.CoreMatchers.is;
-import static org.junit.Assert.assertThat;
+import static org.hamcrest.MatcherAssert.assertThat;
 
-import org.junit.Test;
+import org.junit.jupiter.api.Test;
 
 /**
  * Test for LEDStateDTO