Drupal 9 readiness

$ vendor/bin/drupal-check -d web/modules/contrib/clientside_validation/
22/22 [▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓] 100%

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Line clientside_validation_jquery/clientside_validation_jquery.drush.inc
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55 Call to deprecated function drush_print().
66 Call to deprecated function drush_print().
70 Call to deprecated function file_directory_temp():
in drupal:8.8.0 and is removed from drupal:9.0.0. Use
\Drupal\Core\File\FileSystemInterface::getTempDirectory() instead.
76 Call to deprecated function drush_invoke_process():
See Drush::drush().
89 Call to deprecated function drush_print().
95 Call to deprecated function drush_print().
96 Call to deprecated function drush_delete_dir():
Use \Symfony\Component\Filesystem\Filesystem::remove.
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