Bump nokogiri from 1.13.1 to 1.13.9

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.13.1 to 1.13.9.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/main/CHANGELOG.md)
- [Commits](sparklemotion/nokogiri@v1.13.1...v1.13.9)

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

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

Gemfile.lock

@@ -119,9 +119,11 @@ GEM
       nanoc-cli (~> 4.11, >= 4.11.14)
       nanoc-core (~> 4.11, >= 4.11.14)
     nenv (0.3.0)
-    nokogiri (1.13.1-arm64-darwin)
+    nokogiri (1.13.9-arm64-darwin)
       racc (~> 1.4)
-    nokogiri (1.13.1-x86_64-darwin)
+    nokogiri (1.13.9-x86_64-darwin)
+      racc (~> 1.4)
+    nokogiri (1.13.9-x86_64-linux)
       racc (~> 1.4)
     notiffany (0.1.3)
       nenv (~> 0.1)
@@ -175,6 +177,7 @@ PLATFORMS
   arm64-darwin-21
   x86_64-darwin-21
   x86_64-darwin-22
+  x86_64-linux
 
 DEPENDENCIES
   bundler