#1853: Suppress PMD CloseResource to Java 21

Author: fabriciofx

src/test/java/org/cactoos/func/AsyncTest.java

@@ -24,7 +24,7 @@
  * @since 0.10
  * @checkstyle JavadocMethodCheck (500 lines)
  */
-@SuppressWarnings("PMD.JUnitTestsShouldIncludeAssert")
+@SuppressWarnings({"PMD.JUnitTestsShouldIncludeAssert", "PMD.CloseResource"})
 final class AsyncTest {
     @Test
     void runsInBackground() {