Bump nokogiri from 1.14.3 to 1.15.6

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.14.3 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@v1.14.3...v1.15.6)

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

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

Gemfile.lock

@@ -36,14 +36,14 @@ GEM
       crass (~> 1.0.2)
       nokogiri (>= 1.5.9)
     marcel (1.0.2)
-    mini_portile2 (2.8.2)
-    nokogiri (1.14.3)
-      mini_portile2 (~> 2.8.0)
+    mini_portile2 (2.8.5)
+    nokogiri (1.15.6)
+      mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     parallel (1.12.1)
     parser (3.0.2.0)
       ast (~> 2.4.1)
-    racc (1.6.2)
+    racc (1.7.3)
     rainbow (3.0.0)
     rake (13.0.6)
     rb-fsevent (0.11.2)