ci: Downgrade libxml-ruby

Author: jamesiarmes

Gemfile.lock

@@ -12,7 +12,7 @@ PATH
     cfa-eng-cli (0.1.0)
       aws-sdk-ec2 (~> 1.614)
       aws-sdk-ssm (~> 1.212)
-      libxml-ruby (~> 6.0)
+      libxml-ruby (~> 5.0)
       thor (~> 1.5)
 
 GEM
@@ -45,7 +45,7 @@ GEM
     jmespath (1.6.2)
     json (2.19.5)
     language_server-protocol (3.17.0.5)
-    libxml-ruby (6.0.0)
+    libxml-ruby (5.0.6)
     lint_roller (1.1.0)
     logger (1.7.0)
     parallel (2.1.0)

cfa-eng-cli.gemspec

@@ -25,6 +25,7 @@ Gem::Specification.new do |s|
   s.add_dependency 'aws-sdk-ec2', '~> 1.614'
   s.add_dependency 'aws-sdk-ssm', '~> 1.212'
   # s.add_dependency 'configsl', '~> 1.0'
-  s.add_dependency 'libxml-ruby', '~> 6.0'
+  # aws-sdk-core doesn't support libxml-ruby 6.0 yet.
+  s.add_dependency 'libxml-ruby', '~> 5.0'
   s.add_dependency 'thor', '~> 1.5'
 end