Update dependency html-proofer to v5

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

@@ -24,7 +24,7 @@ GIT
 GEM
  remote: https://rubygems.org/
  specs:
- addressable (2.8.5)
+ addressable (2.8.6)
  public_suffix (>= 2.0.2, < 6.0)
  asciidoctor (2.0.20)
  colorator (1.1.0)
@@ -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 (1.24.0)
  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 (5.0.5)
+ pygments.rb (2.3.1)
+ racc (1.7.3)
  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 (2.6.13)
 
 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