Support checking if things are approaching EOL with endoflife.date

https://endoflife.date/ provides a bunch of EOL dates, maintained by the general community and it has an api!

In theory, we could use this with `osv-detector`: since it knows the packages being used, we could try and see if any of them are in the array returned by `https://endoflife.date/api/all.json`.

In theory again, we could also attempt to pick up versions for other tools from known files, e.g. we could look for `.-version` files and assume they're `.ruby-version`, `.node-version`, etc.

(also for Ruby, we could use the ruby version that gets recorded in the `Gemfile.lock` too)