Bump nokogiri from 1.15.4 to 1.15.6 (#276)

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.15.4 to 1.15.6.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/main/CHANGELOG.md)
- [Commits](sparklemotion/nokogiri@v1.15.4...v1.15.6)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Gemfile.lock

@@ -16,15 +16,15 @@ GEM
     kramdown-parser-gfm (1.1.0)
       kramdown (~> 2.0)
     language_server-protocol (3.17.0.3)
-    mini_portile2 (2.8.4)
-    nokogiri (1.15.4)
+    mini_portile2 (2.8.6)
+    nokogiri (1.15.6)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     parallel (1.23.0)
     parser (3.2.2.4)
       ast (~> 2.4.1)
       racc
-    racc (1.7.1)
+    racc (1.7.3)
     rainbow (3.1.1)
     rbs (2.8.4)
     regexp_parser (2.8.2)