library: some hints for PHP 8.1

library/Director/Data/SerializableValue.php

@@ -82,6 +82,7 @@ class SerializableValue implements Serializable
         return gettype($var);
     }
 
+    #[\ReturnTypeWillChange]
     public function jsonSerialize()
     {
         return $this->value;

library/Director/Db/Branch/BranchModificationInspection.php

@@ -2,6 +2,7 @@
 
 namespace Icinga\Module\Director\Db\Branch;
 
+use gipfl\Translation\StaticTranslator;
 use gipfl\Translation\TranslationHelper;
 use Icinga\Module\Director\Db;
 use ipl\Html\Html;
@@ -56,7 +57,7 @@ class BranchModificationInspection
 
     public static function describeModificationStatistics($stats)
     {
-        $t = TranslationHelper::getTranslator();
+        $t = StaticTranslator::get();
         $relevantStats = [];
         if ($stats->cnt_created > 0) {
             $relevantStats[] = sprintf($t->translate('%d created'), $stats->cnt_created);

library/Director/Objects/IcingaScheduledDowntimeRanges.php

@@ -27,11 +27,13 @@ class IcingaScheduledDowntimeRanges implements Iterator, Countable, IcingaConfig
         $this->object = $object;
     }
 
+    #[\ReturnTypeWillChange]
     public function count()
     {
         return count($this->ranges);
     }
 
+    #[\ReturnTypeWillChange]
     public function rewind()
     {
         $this->position = 0;
@@ -42,6 +44,7 @@ class IcingaScheduledDowntimeRanges implements Iterator, Countable, IcingaConfig
         return $this->modified;
     }
 
+    #[\ReturnTypeWillChange]
     public function current()
     {
         if (! $this->valid()) {
@@ -51,16 +54,19 @@ class IcingaScheduledDowntimeRanges implements Iterator, Countable, IcingaConfig
         return $this->ranges[$this->idx[$this->position]];
     }
 
+    #[\ReturnTypeWillChange]
     public function key()
     {
         return $this->idx[$this->position];
     }
 
+    #[\ReturnTypeWillChange]
     public function next()
     {
         ++$this->position;
     }
 
+    #[\ReturnTypeWillChange]
     public function valid()
     {
         return array_key_exists($this->position, $this->idx);

library/Director/Web/Table/QuickTable.php

@@ -212,6 +212,7 @@ abstract class QuickTable implements Paginatable, ValidHtml
         return $paginator;
     }
 
+    #[\ReturnTypeWillChange]
     public function count()
     {
         $db = $this->db();