Update setOrder plugins signature

[ryanisn]

Despite magento documented desc as string in phpdoc, it is not typed in param signature. In one of the elasticsuite plugin, it passes array to the setOrder
https://github.com/Smile-SA/elasticsuite/blob/affec096d16194addea273dfa35145a42da4213a/src/module-elasticsuite-virtual-category/Plugin/Widget/ProductsListPlugin.php#L152
as you can see the array is assembled here
https://github.com/Smile-SA/elasticsuite/blob/affec096d16194addea273dfa35145a42da4213a/src/module-elasticsuite-virtual-category/Model/Widget/SortOrder/SkuPosition/Builder.php#L63

So to maintain compatibility with elasticsuite for now, we have to remove the string type, other wise it breaks website if there is a product list widget created.

[what-the-diff]

PR Summary

• Refactored variable type declaration in CollectionPlugin.php
  The developers revised the type specification for the variable $dir, within the beforeSetOrder and aroundSetOrder methods in CollectionPlugin.php. Previously, this was exclusively stated to be a string; now, this declaration has been removed to allow for greater flexibility in what types the variable can accept. This could, in turn, lead to enhanced versatility and overall system optimization.

[tuyennn]

Thx @ryanisn for your contribution

[ryanisn]

Awesome, thanks for the quite PR merge!
Can you tag it with a new version so I can install it?

[tuyennn]

Here https://github.com/tuyennn/magento2-outofstockatlast/releases/tag/v1.1.3