refactor: update method parameter type hints in product model

This commit refines the type hints in the Product model. Specifically, the getUrlRewrittenWithHost() method's $Project parameter type is defined more explicitly, indicating that it can accept either a type of QUI\Projects\Project or null.

Related: quiqqer/package-feed#15

merged

mentioned in commit dffe27ab

This MR is included in version 2.4.4

The release is available on GitLab release.

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