Update Sequel, set up debug for debugging newer rubies

Gemfile

@@ -28,13 +28,19 @@ group :test do
   gem "jdbc-sqlite3", platforms: :jruby
   gem "mysql2", "~> 0.5", platforms: :ruby
   gem "pg", "~> 1.2", platforms: :ruby
-  gem "pry", platforms: :jruby
-  gem "pry-byebug", platforms: :ruby
   gem "ruby-oci8", platforms: :ruby if ENV["ROM_USE_ORACLE"]
   gem "sequel_pg", require: false, platforms: :ruby
   gem "sqlite3", "~> 1.4", platforms: :ruby
 
-  if RUBY_VERSION.start_with?("3.4")
+
+  if Gem::Version.new(RUBY_VERSION) >= Gem::Version.new("3.3")
+    gem "debug", platforms: :ruby
+  else
+    gem "pry", platforms: :jruby
+    gem "pry-byebug", platforms: :ruby
+  end
+
+  if Gem::Version.new(RUBY_VERSION) >= Gem::Version.new("3.4")
     gem "mutex_m"
     gem "ostruct"
   end