Bump nokogiri from 1.14.3 to 1.15.6

Bumps [nokogiri](https://github.com/sparklemotion/nokogiri) from 1.14.3 to 1.15.6.
- [Release notes](https://github.com/sparklemotion/nokogiri/releases)
- [Changelog](https://github.com/sparklemotion/nokogiri/blob/main/CHANGELOG.md)
- [Commits](sparklemotion/nokogiri@v1.14.3...v1.15.6)

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

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

Gemfile

@@ -5,7 +5,7 @@ source "https://rubygems.org"
 git_source(:github) {|repo_name| "https://github.com/#{repo_name}" }
 
 gem "jekyll", "~> 4.3.1"
-gem "nokogiri", "~> 1.14"
+gem "nokogiri", "~> 1.15"
 gem "html-proofer", "~> 3.19", ">= 3.19.4"
 gem "jekyll-redirect-from", ">= 0.16.0"
 gem "kramdown-parser-gfm", ">= 1.1.0"

Gemfile.lock

@@ -60,19 +60,19 @@ GEM
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
     mercenary (0.4.0)
-    mini_portile2 (2.8.1)
-    nokogiri (1.14.3)
-      mini_portile2 (~> 2.8.0)
+    mini_portile2 (2.8.5)
+    nokogiri (1.15.6)
+      mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
-    nokogiri (1.14.3-x86_64-darwin)
+    nokogiri (1.15.6-x86_64-darwin)
       racc (~> 1.4)
-    nokogiri (1.14.3-x86_64-linux)
+    nokogiri (1.15.6-x86_64-linux)
       racc (~> 1.4)
     parallel (1.22.1)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     public_suffix (5.0.1)
-    racc (1.6.2)
+    racc (1.7.3)
     rainbow (3.1.1)
     rake (13.0.6)
     rb-fsevent (0.11.2)
@@ -107,7 +107,7 @@ DEPENDENCIES
   jekyll-redirect-from (>= 0.16.0)
   jekyll-sitemap (>= 1.4.0)
   kramdown-parser-gfm (>= 1.1.0)
-  nokogiri (~> 1.14)
+  nokogiri (~> 1.15)
 
 BUNDLED WITH
    2.4.2