Fixes to new interface

Merged Pablo Correa Gomez requested to merge pabloyoyoista/apk-polkit-rs:deps into deps

These are some fixes I needed to do while testing the new interface. The three first commits are mostly trivial, just naming fixes.

The last one might not be that straightforward. The previous behavior (the version of a installed packaged was referenced to as staging_version) was certainly buggy and prone to errors. But the changes now are certainly also opinionated. Let me know what you think.

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