fix(build): pin sass-embedded version

Author: KKamJi98

Gemfile

@@ -5,6 +5,7 @@ source "https://rubygems.org"
 gemspec
 
 gem "html-proofer", "~> 5.0", group: :test
+gem "sass-embedded", "1.77.5" # lock to precompiled build to avoid CI rename failures
 
 platforms :mingw, :x64_mingw, :mswin, :jruby do
   gem "tzinfo", ">= 1", "< 3"