Replaced class ...\MimeTypeGuesser by interface ...\MimeTypeGuesserInterface

Salvatore Arcirequested to merge
issue/search_api_attachments-3213815:3213815-fatal-error-extractfilevalidatorconstruct into 9.0.x

Replaced class \Drupal\Core\File\MimeType\MimeTypeGuesser by \Symfony\Component\Mime\MimeTypeGuesserInterface

Closes #3213815

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