Bump nokogiri from 1.10.9 to 1.12.5

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.10.9 to 1.12.5.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/main/CHANGELOG.md)
- [Commits](sparklemotion/nokogiri@v1.10.9...v1.12.5)

---
updated-dependencies:
- dependency-name: nokogiri
  dependency-type: direct:production
...

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

Gemfile.lock

@@ -111,14 +111,15 @@ GEM
     middleman-syntax (3.2.0)
       middleman-core (>= 3.2)
       rouge (~> 3.2)
-    mini_portile2 (2.4.0)
+    mini_portile2 (2.6.1)
     minitest (5.14.0)
     multi_json (1.14.1)
     net-sftp (2.1.2)
       net-ssh (>= 2.6.5)
     net-ssh (5.2.0)
-    nokogiri (1.10.9)
-      mini_portile2 (~> 2.4.0)
+    nokogiri (1.12.5)
+      mini_portile2 (~> 2.6.1)
+      racc (~> 1.4)
     nokogumbo (2.0.2)
       nokogiri (~> 1.8, >= 1.8.4)
     oj (3.10.5)
@@ -130,6 +131,7 @@ GEM
     padrino-support (0.12.9)
       activesupport (>= 3.1)
     ptools (1.3.5)
+    racc (1.6.0)
     rack (1.6.13)
     rack-livereload (0.3.17)
       rack