[BUGFIX] Fix array access error in LinkAnalyzerResult

Doctrine dbal function fetchAssociative() was used in combination
with accessing an array element without null colesce.

Resolves: #103423
Releases: main, 12.4, 11.5
Change-Id: I6f5842f28722dc8b2716533e818fc40ed2fc25ef
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/83660
Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: core-ci <typo3@b13.com>

typo3/sysext/linkvalidator/Classes/Result/LinkAnalyzerResult.php

@@ -251,7 +251,7 @@ protected function getLocalizedPageId(int $parentId, int $languageId): int
             )
             ->setMaxResults(1)
             ->executeQuery()
-            ->fetchAssociative()['uid'] ?: 0;
+            ->fetchOne();
 
         if ($localizedPageId) {
             $this->localizedPages[$identifier] = $localizedPageId;