Bump nokogiri from 1.12.5 to 1.13.4

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.12.5 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@v1.12.5...v1.13.4)

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

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

Author: dependabot[bot]

Gemfile.lock

@@ -156,7 +156,7 @@ GEM
     marcel (1.0.2)
     method_source (1.0.0)
     mini_mime (1.1.2)
-    mini_portile2 (2.6.1)
+    mini_portile2 (2.8.0)
     minitest (5.14.4)
     multi_json (1.15.0)
     mustermann (1.1.1)
@@ -165,10 +165,10 @@ GEM
       activesupport
     nenv (0.3.0)
     nio4r (2.5.8)
-    nokogiri (1.12.5)
-      mini_portile2 (~> 2.6.1)
+    nokogiri (1.13.4)
+      mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
-    nokogiri (1.12.5-x86_64-linux)
+    nokogiri (1.13.4-x86_64-linux)
       racc (~> 1.4)
     notiffany (0.1.3)
       nenv (~> 0.1)