build(deps): bump nokogiri from 1.15.6 to 1.16.5 in /tests/docker (#480)

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.15.6 to 1.16.5.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/main/CHANGELOG.md)
- [Commits](sparklemotion/nokogiri@v1.15.6...v1.16.5)

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

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

tests/docker/Gemfile.lock

@@ -10,9 +10,9 @@ GEM
     mime-types (3.4.1)
       mime-types-data (~> 3.2015)
     mime-types-data (3.2021.1115)
-    mini_portile2 (2.8.5)
+    mini_portile2 (2.8.6)
     netrc (0.11.0)
-    nokogiri (1.15.6)
+    nokogiri (1.16.5)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     racc (1.7.3)