Dependency Health and Libyear lookups need significant performance increases

Against a larger set of dependencies than the example, I'm seeing:

• Dependency Health: ~25m, ~26000 dependencies
• Libyears: ~4h20m, ~237000 dependencies (and their versions)

This isn't ideal, and means that generating it as part of the build of the database isn't ideal.

Compared to advisories:

• ~1m, ~82000 dependencies

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Upstream discussion: https://github.com/ecosyste-ms/packages/issues/651