feat: use fs.WalkDir instead of filepath.WalkDir

[lebauce]

Description

In fs walker, filepath.WalkDir is used when fs.WalkDir is used almost everywhere else. There are subtle differences, for instance the root directory being a symlink, between the 2 causing inconsistencies between the fs walk and deb post analyze walk. This PR switches the fs walker to the newer fs.WalkDir interface.

Related issues

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Checklist

• [ ] I've read the guidelines for contributing to this repository.
• [ ] I've followed the conventions in the PR title.
• [ ] I've added tests that prove my fix is effective or that my feature works.
• [ ] I've updated the documentation with the relevant information (if needed).
• [ ] I've added usage information (if the PR introduces new options)
• [ ] I've included a "before" and "after" example to the description (if the PR is a user interface change).

[DmitriyLewen]

Hello @lebauce Thanks for your PR!

Looks like the tests are broken now. Can you take a look?

Regards, Dmitriy

[lebauce]

@DmitriyLewen Yes, sorry about that. Fixing the tests and putting it as "draft" until it's fixed

[github-actions[bot]]

This PR is stale because it has been labeled with inactivity.