NO-JIRA Fix minor leak in FileMoveManagerTest

Not closing the InputStream makes this test flaky on Windows. The test
breaks because FileMoveManager::delete(java.io.File) Line 221 fails
to delete the file if it's still "owned" by the JVM process on Windows.

artemis-server/src/test/java/org/apache/activemq/artemis/core/server/files/FileMoveManagerTest.java

@@ -352,11 +352,12 @@ private void createFile(File folder, int i) throws FileNotFoundException {
 
    private void checkFile(File bkpFolder, String file) throws IOException {
       File fileRead = new File(bkpFolder, file);
-      InputStreamReader stream = new InputStreamReader(new FileInputStream(fileRead));
-      BufferedReader reader = new BufferedReader(stream);
-      String valueRead = reader.readLine();
-      int id = Integer.parseInt(file.substring(0, file.indexOf('.')));
-      Assert.assertEquals("content of the file wasn't the expected", id, Integer.parseInt(valueRead));
+      try (InputStreamReader stream = new InputStreamReader(new FileInputStream(fileRead))) {
+         BufferedReader reader = new BufferedReader(stream);
+         String valueRead = reader.readLine();
+         int id = Integer.parseInt(file.substring(0, file.indexOf('.')));
+         Assert.assertEquals("content of the file wasn't the expected", id, Integer.parseInt(valueRead));
+      }
    }
 
 }