Fixed "implicitly marking parameter as nullable" deprecations in PHP 8.4 fixed

src/Services/ImportExportSystem/EntityImporter.php

@@ -357,7 +357,7 @@ class EntityImporter
      * @param iterable                         $entities the list of entities that should be fixed
      * @param  AbstractStructuralDBElement|null  $parent   the parent, to which the entity should be set
      */
-    protected function correctParentEntites(iterable $entities, AbstractStructuralDBElement $parent = null): void
+    protected function correctParentEntites(iterable $entities, ?AbstractStructuralDBElement $parent = null): void
     {
         foreach ($entities as $entity) {
             /** @var AbstractStructuralDBElement $entity */

src/Services/InfoProviderSystem/Providers/OEMSecretsProvider.php

@@ -1221,7 +1221,7 @@ class OEMSecretsProvider implements InfoProviderInterface
      *               - 'value_min' => string|null The minimum value in a range, if applicable.
      *               - 'value_max' => string|null The maximum value in a range, if applicable.
      */
-    private function customSplitIntoValueAndUnit(string $value1, string $value2 = null): array
+    private function customSplitIntoValueAndUnit(string $value1, ?string $value2 = null): array
     {
         // Separate numbers and units (basic parsing handling)
         $unit = null;