Bump nokogiri from 1.16.5 to 1.18.3

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.16.5 to 1.18.3.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/v1.18.3/CHANGELOG.md)
- [Commits](sparklemotion/nokogiri@v1.16.5...v1.18.3)

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

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

Gemfile.lock

@@ -148,11 +148,11 @@ GEM
     middleman-syntax (3.4.0)
       middleman-core (>= 3.2)
       rouge (~> 3.2)
-    mini_portile2 (2.8.6)
+    mini_portile2 (2.8.8)
     minitest (5.25.1)
     multi_json (1.15.0)
     mutex_m (0.2.0)
-    nokogiri (1.16.5)
+    nokogiri (1.18.3)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     openapi3_parser (0.9.2)
@@ -165,7 +165,7 @@ GEM
     parallel (1.23.0)
     parslet (2.0.0)
     public_suffix (5.0.1)
-    racc (1.7.3)
+    racc (1.8.1)
     rack (2.2.11)
     rack-livereload (0.3.17)
       rack