fix: path parsing on Windows (non-unix)

[bheston]

Fix an issue running analyzer in a monorepo with a reference to custom elements in another package. The find-dependencies package converts the path to Unix format, but then uses path.sep to parse the path. On Windows the separators are not the same so it fails.

I tried to add a test for this case, but that branch needs to read the package.json file which I don't believe can happen in the mocked test environment.

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