Bump github.com/miekg/dns from 1.1.67 to 1.1.68 (#4980)

Bumps [github.com/miekg/dns](https://github.com/miekg/dns) from 1.1.67 to 1.1.68.
- [Changelog](https://github.com/miekg/dns/blob/master/Makefile.release)
- [Commits](https://github.com/miekg/dns/compare/v1.1.67...v1.1.68)

---
updated-dependencies:
- dependency-name: github.com/miekg/dns
  dependency-version: 1.1.68
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

go.mod

@@ -8,7 +8,7 @@ require (
 	github.com/golang/mock v1.7.0-rc.1
 	github.com/google/go-cmp v0.7.0
 	github.com/gorilla/websocket v1.5.3
-	github.com/miekg/dns v1.1.67
+	github.com/miekg/dns v1.1.68
 	github.com/pelletier/go-toml v1.9.5
 	github.com/pires/go-proxyproto v0.8.1
 	github.com/quic-go/quic-go v0.54.0