Update PHPDoc for ProductStorageDependencyProvider.php

[umairkj]

PR Description

getProductConcreteStorageCollectionExpanderPlugins function should return an array of ProductConcreteStorageCollectionExpanderPluginInterface in PHPDocs

Checklist

• I agree with the Code Contribution License Agreement in CONTRIBUTING.md

[spryker-release-bot]

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[artem-png]

Dear @jadoon88,

We want to express our appreciation for your recent contribution to our project.

Your pull request has been diligently reviewed, processed following our internal processes, and successfully merged into our codebase. You can find the commit here.

Thanks a lot for your contribution!

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Spryker Team