Update dependency html-proofer to v5

Author: renovate[bot]

Gemfile

@@ -34,7 +34,7 @@ end
 
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem
 gem "tzinfo-data", platforms: [:mingw, :mswin, :x64_mingw, :jruby]
-gem 'pygments.rb', '~> 2.4.0'
+gem 'pygments.rb', '~> 2.3.1'
 
 # Performance-booster for watching directories on Windows
 gem "wdm", "~> 0.1.0" if Gem.win_platform?

Gemfile.lock

@@ -24,8 +24,8 @@ GIT
 GEM
   remote: https://rubygems.org/
   specs:
-    addressable (2.8.5)
-      public_suffix (>= 2.0.2, < 6.0)
+    addressable (2.8.7)
+      public_suffix (>= 2.0.2, < 7.0)
     asciidoctor (2.0.20)
     colorator (1.1.0)
     concurrent-ruby (1.2.2)
@@ -40,7 +40,7 @@ GEM
       ffi (>= 1.15.0)
     eventmachine (1.2.7)
     execjs (2.9.1)
-    ffi (1.16.3)
+    ffi (1.17.0)
     ffi-compiler (1.0.1)
       ffi (>= 1.0.0)
       rake
@@ -123,18 +123,18 @@ GEM
       rake (~> 13.0)
     mercenary (0.4.0)
     multi_json (1.15.0)
-    nokogiri (1.15.4-arm64-darwin)
+    nokogiri (1.15.6-arm64-darwin)
       racc (~> 1.4)
-    nokogiri (1.15.4-x86_64-linux)
+    nokogiri (1.15.6-x86_64-linux)
       racc (~> 1.4)
     openssl (3.2.0)
-    parallel (1.23.0)
+    parallel (1.26.3)
     pathutil (0.16.2)
       forwardable-extended (~> 2.6)
     posix-spawn (0.3.15)
-    public_suffix (5.0.3)
-    pygments.rb (2.4.0)
-    racc (1.7.1)
+    public_suffix (5.1.1)
+    pygments.rb (2.3.1)
+    racc (1.8.1)
     rainbow (3.1.1)
     rake (13.0.6)
     rb-fsevent (0.11.2)
@@ -149,7 +149,7 @@ GEM
     string_inflection (0.1.2)
     terminal-table (3.0.2)
       unicode-display_width (>= 1.1.1, < 3)
-    typhoeus (1.4.0)
+    typhoeus (1.4.1)
       ethon (>= 0.9.0)
     uglifier (4.2.0)
       execjs (>= 0.3.0, < 3)
@@ -163,7 +163,7 @@ GEM
       nokogiri (>= 1.13)
     webrick (1.8.1)
     yell (2.2.2)
-    zeitwerk (2.6.12)
+    zeitwerk (2.6.18)
 
 PLATFORMS
   arm64-darwin-23
@@ -182,7 +182,7 @@ DEPENDENCIES
   jekyll-postfiles
   jekyll-theme-clean-blog!
   jekyll-webmention_io!
-  pygments.rb (~> 2.4.0)
+  pygments.rb (~> 2.3.1)
   rake
   tzinfo-data