Bump nokogiri from 1.15.6 to 1.18.3

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.15.6 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@v1.15.6...v1.18.3)

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

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

Gemfile.lock

@@ -95,7 +95,7 @@ GEM
       mime-types-data (~> 3.2015)
     mime-types-data (3.2023.1003)
     mini_mime (1.1.5)
-    mini_portile2 (2.8.5)
+    mini_portile2 (2.8.8)
     minitest (5.20.0)
     multi_json (1.15.0)
     mustermann (3.0.0)
@@ -107,7 +107,7 @@ GEM
     newrelic_rpm (9.6.0)
       base64
     nio4r (2.7.3)
-    nokogiri (1.15.6)
+    nokogiri (1.18.3)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     notiffany (0.1.3)
@@ -123,7 +123,7 @@ GEM
     public_suffix (5.0.3)
     puma (6.4.3)
       nio4r (~> 2.0)
-    racc (1.7.3)
+    racc (1.8.1)
     rack (3.0.9.1)
     rack-accept (0.4.5)
       rack (>= 0.4)