Test for Drupal 9 deprecations

 3/3 [============================] 100%

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  Line   src\Plugin\Block\PhpInsightsBlock.php
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  111    \Drupal calls should be avoided in classes, use dependency injection instead
  155    Variable $projects_json might not be defined.
  156    Variable $projects_json might not be defined.
  179    \Drupal calls should be avoided in classes, use dependency injection instead
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 [ERROR] Found 4 errors