Bump nokogiri from 1.19.1 to 1.19.4 in /docs

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.19.1 to 1.19.4.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/main/CHANGELOG.md)
- [Commits](sparklemotion/nokogiri@v1.19.1...v1.19.4)

---
updated-dependencies:
- dependency-name: nokogiri
  dependency-version: 1.19.4
  dependency-type: direct:production
...

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

Author: dependabot[bot]

docs/Gemfile

@@ -3,6 +3,6 @@ source "https://rubygems.org"
 gem 'github-pages', group: :jekyll_plugins
 
 # Added at 2019-11-25 10:11:40 -0800 by jhoward:
-gem "nokogiri", "< 1.19.2"
+gem "nokogiri", "< 1.19.5"
 gem "jekyll", ">= 3.7"
 gem "kramdown", ">= 2.3.0"

docs/Gemfile.lock

@@ -233,7 +233,7 @@ GEM
     minitest (5.27.0)
     net-http (0.9.1)
       uri (>= 0.11.1)
-    nokogiri (1.19.1)
+    nokogiri (1.19.4)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     octokit (4.25.1)
@@ -281,7 +281,7 @@ DEPENDENCIES
   github-pages
   jekyll (>= 3.7)
   kramdown (>= 2.3.0)
-  nokogiri (< 1.19.2)
+  nokogiri (< 1.19.5)
 
 BUNDLED WITH
    2.0.2