mod: upgrade miekg/dns library to fix dependabot alert

We're using an old and potentially vulnerable version of the DNS
resolution library. This commit bumps the library to the latest
recommended version.

docs/release-notes/release-notes-0.14.0.md

@@ -38,6 +38,8 @@ addholdinvoice call](https://github.com/lightningnetwork/lnd/pull/5533).
   in place](https://github.com/lightningnetwork/lnd/pull/5545).
 * [Added minor fixes to contribution guidelines](https://github.com/lightningnetwork/lnd/pull/5503).
 * [Fixed typo in `dest_custom_records` description comment](https://github.com/lightningnetwork/lnd/pull/5541).
+* [Bumped version of `github.com/miekg/dns` library to fix a Dependabot
+  alert](https://github.com/lightningnetwork/lnd/pull/5576).
 
 ## Database