Bump nokogiri from 1.12.5 to 1.13.9 (#544)

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.12.5 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@v1.12.5...v1.13.9)

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

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Philipp Bayer <PhilippBay@gmail.com>

Gemfile.lock

@@ -191,7 +191,7 @@ GEM
       nokogiri (~> 1)
       rake
     mini_mime (1.1.2)
-    mini_portile2 (2.6.1)
+    mini_portile2 (2.8.0)
     minitest (5.15.0)
     mocha (1.5.0)
       metaclass (~> 0.0.1)
@@ -205,8 +205,8 @@ GEM
     net-ssh-gateway (2.0.0)
       net-ssh (>= 4.0.0)
     netrc (0.11.0)
-    nokogiri (1.12.5)
-      mini_portile2 (~> 2.6.1)
+    nokogiri (1.13.9)
+      mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
     nokogumbo (2.0.2)
       nokogiri (~> 1.8, >= 1.8.4)