Fix hash calculation on 32-bit targets #109
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While doing another PR I noticed this bug in the hash calculation used to find the local index directory for a registry, the use of usize would result in different hashes on 32-bit architectures. Apparently this is not an issue since no one has complained AFAICT, but might as well fix it to potentially save some pain in the future.
See EmbarkStudios/cargo-deny#374