Fix PHP 8.4 deprecation warning
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@ -76,7 +76,7 @@ class kolab_storage_cache
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/**
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* Default constructor
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*/
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public function __construct(kolab_storage_folder $storage_folder = null)
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public function __construct(?kolab_storage_folder $storage_folder = null)
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{
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$rcmail = rcube::get_instance();
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$this->db = $rcmail->get_dbh();
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