[TASK] Avoid implicitly nullable class method parameter in `EXT:belog`

With PHP 8.4 marking method parameter implicitly nullable
is deprecated and will emit a `E_DEPRECATED` warning. One
recommended way to resolve this, is making it explicitly
nullable using the `?` nullable operator or adding a null
type to an union type definition. [1]

This prepares the way towards PHP 8.4 compatibility.

[1] https://php.watch/versions/8.4/implicitly-marking-parameter-type-nullable-deprecated

Resolves: #104265
Releases: main, 12.4, 11.5
Change-Id: Ifb6887a9fc77bc74c2d287b34a6876cc5da477da
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/85020


Reviewed-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Mogens Fiebrandt <mogens.fiebrandt@googlemail.com>
Tested-by: Stefan Bürk <stefan@buerk.tech>
Tested-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>

typo3/sysext/belog/Classes/Controller/BackendLogController.php

@@ -66,7 +66,7 @@ class BackendLogController extends ActionController
     /**
      * Show general information and the installed modules
      */
-    public function listAction(Constraint $constraint = null, string $operation = ''): ResponseInterface
+    public function listAction(?Constraint $constraint = null, string $operation = ''): ResponseInterface
     {
         if ($operation === 'reset-filters') {
             $constraint = new Constraint();

typo3/sysext/belog/Classes/Controller/SystemInformationController.php

@@ -35,7 +35,7 @@ final class SystemInformationController
 {
     protected array $backendUserConfiguration;
 
-    public function __construct(array $backendUserConfiguration = null)
+    public function __construct(?array $backendUserConfiguration = null)
     {
         $this->backendUserConfiguration = $backendUserConfiguration ?? $GLOBALS['BE_USER']->uc;
     }