[Security] Bump nokogiri from 1.11.2 to 1.12.0

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.11.2 to 1.12.0. **This update includes security fixes.**
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/main/CHANGELOG.md)
- [Commits](sparklemotion/nokogiri@v1.11.2...v1.12.0)

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

Gemfile.lock

@@ -157,7 +157,9 @@ GEM
     marcel (0.3.3)
       mimemagic (~> 0.3.2)
     method_source (1.0.0)
-    mimemagic (0.3.5)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mina (1.2.3)
       open4 (~> 1.3.4)
       rake
@@ -171,19 +173,19 @@ GEM
     mina-sidekiq (1.0.3)
       mina (>= 1.0.2)
     mini_mime (1.0.2)
-    mini_portile2 (2.5.0)
+    mini_portile2 (2.6.1)
     minitest (5.14.1)
     mustermann (1.1.1)
       ruby2_keywords (~> 0.0.1)
     nenv (0.3.0)
     newrelic_rpm (6.11.0.365)
     nio4r (2.5.2)
-    nokogiri (1.11.2)
-      mini_portile2 (~> 2.5.0)
+    nokogiri (1.12.0)
+      mini_portile2 (~> 2.6.1)
       racc (~> 1.4)
-    nokogiri (1.11.2-x64-mingw32)
+    nokogiri (1.12.0-x64-mingw32)
       racc (~> 1.4)
-    nokogiri (1.11.2-x86_64-linux)
+    nokogiri (1.12.0-x86_64-linux)
       racc (~> 1.4)
     notiffany (0.1.3)
       nenv (~> 0.1)