update hickory-resolver

[andrewkmin]

Summary & Motivation (Problem vs. Solution)

$title

How I Tested These Changes

Pre merge check list

• Update CHANGELOG.MD

[andrewkmin]

feature was renamed to tokio as of https://github.com/hickory-dns/hickory-dns/releases/tag/v0.25.0

[cr-tk]

@andrewkmin the CI shows some failing tests, apparently due to API/namespace changes in hickory, so I think going to 0.25.x requires some code changes as well.

Based on the 0.25.0 changelog, they made a lot of changes in the new minor version. The README suggests they try to follow SemVer, but it seems that in this case they didn't.

I've noticed that you're switching to hickory-resolver 0.25.1 even though 0.25.2 is available. Does this have a specific reason, could we bump this further?

[cr-tk]

@andrewkmin as discussed internally, I've created #554 to adopt our code to the new API changes and do some other hickory-resolver related improvements we had planned.

It's a superset of #538, so I'm closing this PR here.