Update dependency html-proofer to v5

renovate[bot] · web-flow · commit c56496766d3a · 2023-03-31T13:41:13.000Z
diff --git a/Gemfile b/Gemfile
@@ -5,7 +5,7 @@ source "https://rubygems.org"
 gem "jekyll-theme-chirpy", "~> 5.5", ">= 5.5.2"
 
 group :test do
-  gem "html-proofer", "~> 3.18"
+  gem "html-proofer", "~> 5.0"
 end
 
 # Windows and JRuby does not include zoneinfo files, so bundle the tzinfo-data gem
