Upgrade: Bump nokogiri from 1.15.3 to 1.15.4

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.15.3 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@v1.15.3...v1.15.4)

---
updated-dependencies:
- dependency-name: nokogiri
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Gemfile.lock

@@ -16,9 +16,9 @@ GEM
     docile (1.4.0)
     json (2.6.3)
     language_server-protocol (3.17.0.3)
-    mini_portile2 (2.8.2)
+    mini_portile2 (2.8.4)
     minitest (5.19.0)
-    nokogiri (1.15.3)
+    nokogiri (1.15.4)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     parallel (1.23.0)