Bump nokogiri from 1.13.4 to 1.13.6

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.13.4 to 1.13.6.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/main/CHANGELOG.md)
- [Commits](https://github.com/sparklemotion/nokogiri/compare/v1.13.4...v1.13.6)

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

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

Gemfile.lock

@@ -178,7 +178,9 @@ GEM
     nanaimo (0.3.0)
     naturally (2.2.1)
     netrc (0.11.0)
-    nokogiri (1.13.4-arm64-darwin)
+    nokogiri (1.13.6-arm64-darwin)
+      racc (~> 1.4)
+    nokogiri (1.13.6-x86_64-linux)
       racc (~> 1.4)
     optparse (0.1.1)
     os (1.1.4)
@@ -246,6 +248,7 @@ GEM
 
 PLATFORMS
   arm64-darwin-21
+  x86_64-linux
 
 DEPENDENCIES
   fastlane