Suppress warnings in tests

spring-context-support/src/test/java/org/springframework/cache/caffeine/CaffeineCacheManagerTests.java

@@ -36,6 +36,7 @@ import static org.mockito.Mockito.mock;
 public class CaffeineCacheManagerTests {
 
 	@Test
+	@SuppressWarnings("cast")
 	public void testDynamicMode() {
 		CacheManager cm = new CaffeineCacheManager();