Bump nokogiri from 1.13.5 to 1.13.6 in /meta/docker/rzz

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.13.5 to 1.13.6.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/main/CHANGELOG.md)
- [Commits](https://github.com/sparklemotion/nokogiri/compare/v1.13.5...v1.13.6)

---
updated-dependencies:
- dependency-name: nokogiri
  dependency-type: direct:production
...

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

meta/docker/rzz/Gemfile.lock

@@ -8,7 +8,7 @@ GEM
       rb-inotify (~> 0.9, >= 0.9.10)
     method_source (0.9.2)
     mini_portile2 (2.8.0)
-    nokogiri (1.13.5)
+    nokogiri (1.13.6)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
     pry (0.12.2)