Bump nokogiri from 1.13.10 to 1.15.4

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.13.10 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@v1.13.10...v1.15.4)

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

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile.lock

@@ -78,11 +78,11 @@ GEM
       nokogiri (>= 1.5.9)
     method_source (1.0.0)
     mini_mime (1.1.2)
-    mini_portile2 (2.8.1)
+    mini_portile2 (2.8.4)
     minitest (5.17.0)
     multi_xml (0.6.0)
-    nokogiri (1.13.10)
-      mini_portile2 (~> 2.8.0)
+    nokogiri (1.15.4)
+      mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     octokit (4.25.1)
       faraday (>= 1, < 3)
@@ -139,7 +139,7 @@ GEM
       coderay (~> 1.1)
       method_source (~> 1.0)
     public_suffix (5.0.1)
-    racc (1.6.2)
+    racc (1.7.1)
     rack (3.0.3)
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)