Bump nokogiri in /_site/play-with-docker/Portus/Portus.1

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.13.9 to 1.15.4.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/main/CHANGELOG.md)
- [Commits](sparklemotion/nokogiri@v1.13.9...v1.15.4)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

_site/play-with-docker/Portus/Portus.1/Gemfile.lock

@@ -193,16 +193,16 @@ GEM
       mime-types-data (~> 3.2015)
     mime-types-data (3.2021.0225)
     mini_mime (1.1.0)
-    mini_portile2 (2.8.0)
+    mini_portile2 (2.8.4)
     minitest (5.14.4)
     multi_json (1.11.2)
     multipart-post (2.0.0)
     mysql2 (0.3.18)
     nenv (0.3.0)
     net-ldap (0.11)
     nio4r (2.5.8)
-    nokogiri (1.13.9)
-      mini_portile2 (~> 2.8.0)
+    nokogiri (1.15.4)
+      mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     notiffany (0.0.8)
       nenv (~> 0.1)
@@ -239,7 +239,7 @@ GEM
       activesupport (>= 3.0.0)
     quiet_assets (1.1.0)
       railties (>= 3.1, < 5.0)
-    racc (1.6.0)
+    racc (1.7.1)
     rack (1.6.13)
     rack-mini-profiler (0.9.3)
       rack (>= 1.1.3)