Bump nokogiri from 1.16.3 to 1.18.4 in /docker-images/buildbox (#30)

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.16.3 to 1.18.4.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/main/CHANGELOG.md)
- [Commits](sparklemotion/nokogiri@v1.16.3...v1.18.4)

---
updated-dependencies:
- dependency-name: nokogiri
  dependency-type: indirect
...

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

Author: dependabot[bot]

docker-images/buildbox/Gemfile.lock

@@ -2,16 +2,16 @@ GEM
   remote: https://rubygems.org/
   specs:
     bluecloth (2.2.0)
-    mini_portile2 (2.8.5)
+    mini_portile2 (2.8.8)
     mizuho (0.9.20)
       nokogiri (>= 1.4.0)
       sqlite3
     net-http-persistent (2.9.4)
-    nokogiri (1.16.3)
+    nokogiri (1.18.4)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     paint (0.9.0)
-    racc (1.7.3)
+    racc (1.8.1)
     rake (12.3.3)
     sqlite3 (1.3.10)