build(deps): replace tiny-lru with toad-cache

[kibertoad]

This brings fastify-reply-from in line with fastify, fastify-cigtm and fastify-rate-limit, by switching to toad-cache, which is faster than tiny-lry, and to a map-based (as opposed to object-based) cache, which is faster for string keys.

See benchmark results.

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

[mcollina]

lgtm

[gurgunday]

Thanks!

I was waiting for some free time to take this on