Detects when file:./foo.tgz files have changed

[arcanis]

What's the problem this PR addresses?

While file:./folder references are properly updated when their content changes, the same doesn't happen for file:./file.tgz references.

Fixes #5186

How did you fix it?

The resolver will now check the tgz file hash, so that changing its content should lead to the cache entry being refetched.

Checklist

• I have read the Contributing Guide.

• I have set the packages that need to be released for my changes to be effective.

• I will check that all automated PR checks pass before the PR gets reviewed.