[BUGFIX] Fixes annotation of parameter in ExtensionConfiguration

Add mixed annotation of parameter $value in ExtensionConfiguration
of method set. The static code analysis tools line phpstan can deal
with it

Resolves: #92181
Releases: master, 10.4
Change-Id: I9dc39737a7f6009c2dcb736c04131018a88ee36b
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/65541


Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Alexander Schnitzler <git@alexanderschnitzler.de>
Tested-by: Daniel Goerz <daniel.goerz@posteo.de>
Reviewed-by: Oliver Klee <typo3-coding@oliverklee.de>
Reviewed-by: Alexander Schnitzler <git@alexanderschnitzler.de>
Reviewed-by: Daniel Goerz <daniel.goerz@posteo.de>

typo3/sysext/core/Classes/Configuration/ExtensionConfiguration.php

@@ -143,7 +143,7 @@ class ExtensionConfiguration
      *
      * @param string $extension Extension name
      * @param string $path Configuration path to set - eg. "featureCategory/coolThingIsEnabled"
-     * @param null $value The value. If null, unset the path
+     * @param mixed|null $value The value. If null, unset the path
      * @internal
      */
     public function set(string $extension, string $path = '', $value = null): void