[IO-811] Files.walk() direct and indirect callers fail to close the

returned Stream<Path>

- Release resource in test

src/test/java/org/apache/commons/io/file/FilesUncheckTest.java

@@ -210,12 +210,16 @@ public void testIsSameFile() {
 
     @Test
     public void testLinesPath() {
-        assertEquals(0, FilesUncheck.lines(FILE_PATH_EMPTY).count());
+        try (Stream<String> stream = FilesUncheck.lines(FILE_PATH_EMPTY)) {
+            assertEquals(0, stream.count());
+        }
     }
 
     @Test
     public void testLinesPathCharset() {
-        assertEquals(0, FilesUncheck.lines(FILE_PATH_EMPTY, StandardCharsets.UTF_8).count());
+        try (Stream<String> stream = FilesUncheck.lines(FILE_PATH_EMPTY, StandardCharsets.UTF_8)) {
+            assertEquals(0, stream.count());
+        }
     }
 
     @Test