Bump nokogiri from 1.14.0 to 1.15.4

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.14.0 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@v1.14.0...v1.15.4)

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

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

Gemfile.lock

@@ -111,15 +111,15 @@ GEM
     net-smtp (0.3.2)
       net-protocol
     nio4r (2.5.8)
-    nokogiri (1.14.0-x86_64-darwin)
+    nokogiri (1.15.4-x86_64-darwin)
       racc (~> 1.4)
-    nokogiri (1.14.0-x86_64-linux)
+    nokogiri (1.15.4-x86_64-linux)
       racc (~> 1.4)
     parallel (1.22.1)
     parser (3.1.2.1)
       ast (~> 2.4.1)
     pg (1.4.4)
-    racc (1.6.2)
+    racc (1.7.1)
     rack (2.2.6.2)
     rack-test (2.0.2)
       rack (>= 1.3)