Bump nokogiri from 1.13.6 to 1.13.9

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.13.6 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@v1.13.6...v1.13.9)

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

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

Author: dependabot[bot]

Gemfile.lock

@@ -20,8 +20,6 @@ GEM
     faraday (0.13.1)
       multipart-post (>= 1.2, < 3)
     ffi (1.11.2)
-    ffi (1.11.2-x64-mingw32)
-    ffi (1.11.2-x86-mingw32)
     gemoji (2.1.0)
     github-pages (92)
       activesupport (= 4.2.7)
@@ -101,13 +99,9 @@ GEM
     minitest (5.11.1)
     multipart-post (2.0.0)
     net-dns (0.8.0)
-    nokogiri (1.13.6)
+    nokogiri (1.13.9)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
-    nokogiri (1.13.6-x64-mingw32)
-      racc (~> 1.4)
-    nokogiri (1.13.6-x86-mingw32)
-      racc (~> 1.4)
     octokit (4.8.0)
       sawyer (~> 0.8.0, >= 0.5.3)
     public_suffix (1.5.3)