build(deps): bump dnsruby from 1.61.6 to 1.61.7 in /docs

Bumps [dnsruby](https://github.com/alexdalitz/dnsruby) from 1.61.6 to 1.61.7.
- [Release notes](https://github.com/alexdalitz/dnsruby/releases)
- [Changelog](https://github.com/alexdalitz/dnsruby/blob/master/RELEASE_NOTES.md)
- [Commits](alexdalitz/dnsruby@v1.61.6...v1.61.7)

---
updated-dependencies:
- dependency-name: dnsruby
  dependency-type: indirect
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

docs/Gemfile.lock

@@ -17,7 +17,7 @@ GEM
     commonmarker (0.17.13)
       ruby-enum (~> 0.5)
     concurrent-ruby (1.1.9)
-    dnsruby (1.61.6)
+    dnsruby (1.61.7)
       simpleidn (~> 0.1)
     em-websocket (0.5.2)
       eventmachine (>= 0.12.9)