Upgrade to toad-scheduler 2.0.0

[kibertoad]

Checklist

• run npm run test and npm run benchmark
• tests and/or benchmarks are included
• documentation is changed or added
• commit message and code follows the Developer's Certification of Origin
  and the Code of conduct

[Eomm]

Please @kibertoad, could you wait for at least one review from one @fastify/plugins member?

I saw you have already released the v4, could you add a GH release as well?

I did manually the last one: https://github.com/fastify/fastify-schedule/releases/tag/v3.0.2
But I may don't see these kinds of changes in future

[kibertoad]

@Eomm Sorry for that. There wasn't much to review, it was pretty much straightforward a bump. But I'll make sure to wait next time!

Created the release as well.

[Fdawgs]

@kibertoad, tag and release appear to be missing the leading v, which was present in other releases?
Not massively important, just nice to be consistent.

[kibertoad]

@Fdawgs my bad. will rename release and will be more careful in the future, sorry