Close scanner

Author: Caitlin Bales (MSFT)

src/main/java/com/microsoft/graph/http/DefaultHttpProvider.java

@@ -419,8 +419,11 @@ void setConnectionFactory(final IConnectionFactory factory) {
     public static String streamToString(final InputStream input) {
         final String httpStreamEncoding = "UTF-8";
         final String endOfFile = "\\A";
-        final Scanner scanner = new Scanner(input, httpStreamEncoding).useDelimiter(endOfFile);
-        return scanner.next();
+        final Scanner scanner = new Scanner(input, httpStreamEncoding);
+        scanner.useDelimiter(endOfFile);
+        String scannerString = scanner.next();
+        scanner.close();
+        return scannerString;
     }
 
     /**