Dependency version lag metric

[ryscheng-mobile]

What is it?

It'd be nice to track how quickly projects update a certain dependency. The hypothesis is that if the dependency were more important (e.g. Next.js), you would update it more frequently.
Less important dependencies, maybe you update less frequently.

I'm not sure if this actually holds as a value judgement (e.g. libpng), but it's worth tracking in any case