[BUGFIX] Fix type annotation in the GeneralUtility stub

For variable arguments, the type annotation needs to match the
type of the single arguments, not an array of the single arguments.

This change parallels that in the TYPO3 Core:
https://review.typo3.org/c/Packages/TYPO3.CMS/+/78080

Author: oliverklee

stubs/GeneralUtility.stub

@@ -6,7 +6,7 @@ class GeneralUtility
     /**
      * @template T of object
      * @phpstan-param class-string<T> $className
-     * @phpstan-param array<int, mixed> $constructorArguments
+     * @phpstan-param mixed $constructorArguments
      * @phpstan-return T
      */
     public static function makeInstance($className, ...$constructorArguments);