Added all missing use statements from global functions and constants

module/Core/src/Exception/NonUniqueSlugException.php

@@ -3,6 +3,8 @@ declare(strict_types=1);
 
 namespace Shlinkio\Shlink\Core\Exception;
 
+use function sprintf;
+
 class NonUniqueSlugException extends InvalidArgumentException
 {
     public static function fromSlug(string $slug): self