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

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: #104263
Releases: main, 12.4, 11.5
Change-Id: I7f132b2d3f7df9ba620b26656bbfca7fd038f32a
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/85015


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

typo3/sysext/dashboard/Classes/ServiceProvider.php

@@ -83,7 +83,7 @@ class ServiceProvider extends AbstractServiceProvider
 
     public static function configureDashboardPresetRegistry(
         ContainerInterface $container,
-        DashboardPresetRegistry $dashboardPresetRegistry = null
+        ?DashboardPresetRegistry $dashboardPresetRegistry = null
     ): DashboardPresetRegistry {
         $dashboardPresetRegistry = $dashboardPresetRegistry ?? self::new($container, DashboardPresetRegistry::class);
         $cache = $container->get('cache.core');
@@ -111,7 +111,7 @@ class ServiceProvider extends AbstractServiceProvider
 
     public static function configureWidgetGroupRegistry(
         ContainerInterface $container,
-        WidgetGroupRegistry $widgetGroupRegistry = null
+        ?WidgetGroupRegistry $widgetGroupRegistry = null
     ): WidgetGroupRegistry {
         $widgetGroupRegistry = $widgetGroupRegistry ?? self::new($container, WidgetGroupRegistry::class);
         $cache = $container->get('cache.core');
@@ -158,10 +158,10 @@ class ServiceProvider extends AbstractServiceProvider
     /**
      * @param ContainerInterface $container
      * @param ArrayObject $widgetGroups
-     * @param string $path supplied when invoked internally through PseudoServiceProvider
+     * @param string|null $path supplied when invoked internally through PseudoServiceProvider
      * @return ArrayObject
      */
-    public static function configureWidgetGroups(ContainerInterface $container, ArrayObject $widgetGroups, string $path = null): ArrayObject
+    public static function configureWidgetGroups(ContainerInterface $container, ArrayObject $widgetGroups, ?string $path = null): ArrayObject
     {
         $paths = self::getPathsOfInstalledPackages();
 
@@ -180,10 +180,10 @@ class ServiceProvider extends AbstractServiceProvider
     /**
      * @param ContainerInterface $container
      * @param ArrayObject $widgets
-     * @param string $path supplied when invoked internally through PseudoServiceProvider
+     * @param string|null $path supplied when invoked internally through PseudoServiceProvider
      * @return ArrayObject
      */
-    public static function configureWidgets(ContainerInterface $container, ArrayObject $widgets, string $path = null): ArrayObject
+    public static function configureWidgets(ContainerInterface $container, ArrayObject $widgets, ?string $path = null): ArrayObject
     {
         $paths = self::getPathsOfInstalledPackages();