[TASK] Fix phpstan checkFunctionArgumentTypes errors in ext:core Site

This patch fixes incompatible type usage in function arguments
and is preparatory work for introducing native type hints and
strict mode in all core files.

Releases: master, 10.4
Resolves: #92272
Change-Id: I83c32dfcd22dfb9d3e5f4d968ab5290f550f3e79
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/65667


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>

typo3/sysext/core/Classes/Site/Entity/NullSite.php

@@ -152,7 +152,7 @@ class NullSite implements SiteInterface
                 'flag' => 'flags-multiple'
             ]);
         }
-        $pageTs = BackendUtility::getPagesTSconfig($pageId);
+        $pageTs = BackendUtility::getPagesTSconfig((int)$pageId);
         $pageTs = $pageTs['mod.']['SHARED.'] ?? [];
 
         $disabledLanguages = GeneralUtility::intExplode(',', $pageTs['disableLanguages'] ?? '', true);