use of deprecated method in module file

Line   block_cache.module                                                        
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  27     Call to deprecated method url() of class Drupal:                          
         in drupal:8.0.0 and is removed from drupal:9.0.0.                         
         Instead create a \Drupal\Core\Url object directly, for example using      
         Url::fromRoute().                                                         
  40     Call to an undefined method Drupal\Core\Form\FormInterface::getEntity().  
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