Replace deprecated l() with Link()

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Line src/Controller/SupermonitoringController.php
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70 Call to deprecated method l() of class Drupal:
in Drupal 8.0.0 and will be removed before Drupal 9.0.0.
Use \Drupal\Core\Link instead.
Example:
89 Call to deprecated method l() of class Drupal:
in Drupal 8.0.0 and will be removed before Drupal 9.0.0.
Use \Drupal\Core\Link instead.
Example:
108 Call to deprecated method l() of class Drupal:
in Drupal 8.0.0 and will be removed before Drupal 9.0.0.
Use \Drupal\Core\Link instead.
Example:
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[ERROR] Found 3 errors