Drupal 9 Compatibility

I have applied the Patch and checked with upgrade status. The issue mentioned has been solved but there is a deprecated method which needs to be fixed as well.

drupal-check -d file_update
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 ------ ----------------------------------------------------------------------- 
  Line   src/FileUpdateService.php                                              
 ------ ----------------------------------------------------------------------- 
  586    Call to deprecated method validScheme() of class                       
         Drupal\Core\File\FileSystem:                                           
         in drupal:8.0.0 and is removed from drupal:9.0.0. Use                  
         Drupal\Core\StreamWrapper\StreamWrapperManagerInterface::isValidSchem  
         e()                                                                    
         instead.                                                               
 ------ ----------------------------------------------------------------------- 

 [ERROR] Found 1 error

Applied the patch in #3 and added new alteration to avoid deprecation error.

11/11 [▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓] 100%


 [OK] No errors 

Thank you @yonas.legesse, but I could not apply patch, because obviously StreamWrapperManagerInterface is an interface.
But I also can't call the method staticly.

At the end code looks like this:

  public function isValidUri($uri) {
    /** @var StreamWrapperManagerInterface $stream_wrapper_manager */
    $stream_wrapper_manager = \Drupal::service('stream_wrapper_manager');
    return $stream_wrapper_manager->isValidScheme($uri);
  }