Bump nokogiri from 1.10.9 to 1.13.4

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.10.9 to 1.13.4.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/v1.13.4/CHANGELOG.md)
- [Commits](sparklemotion/nokogiri@v1.10.9...v1.13.4)

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

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

Author: dependabot[bot]

Gemfile.lock

@@ -75,15 +75,17 @@ GEM
     materialize-sass (0.97.0)
       sass (~> 3.3)
     mime-types (2.6.1)
-    mini_portile2 (2.4.0)
+    mini_portile2 (2.8.0)
     minitest (5.14.1)
     multi_json (1.11.2)
-    nokogiri (1.10.9)
-      mini_portile2 (~> 2.4.0)
-    nokogiri (1.10.9-x64-mingw32)
-      mini_portile2 (~> 2.4.0)
-    nokogiri (1.10.9-x86-mingw32)
-      mini_portile2 (~> 2.4.0)
+    nokogiri (1.13.4)
+      mini_portile2 (~> 2.8.0)
+      racc (~> 1.4)
+    nokogiri (1.13.4-x64-mingw32)
+      racc (~> 1.4)
+    nokogiri (1.13.4-x86-mingw32)
+      racc (~> 1.4)
+    racc (1.6.0)
     rack (1.6.13)
     rack-test (0.6.3)
       rack (>= 1.0)