feat: automatically send empty body for end request, also add support for ruby 4.0+

Author: pirate

lib/stagehand/internal/util.rb

@@ -272,7 +272,12 @@ class << self
         #
         # @return [Hash{String=>Array<String>}]
         def decode_query(query)
-          CGI.parse(query.to_s)
+          return {} if query.nil? || query.empty?
+
+          # Use URI.decode_www_form for Ruby 3.2+ and 4.0+ compatibility
+          URI.decode_www_form(query.to_s).each_with_object({}) do |(key, value), hash|
+            (hash[key] ||= []) << value
+          end
         end
 
         # @api private

lib/stagehand/resources/sessions.rb

@@ -140,6 +140,7 @@ def end_(id, params = {})
             x_sent_at: "x-sent-at",
             x_stream_response: "x-stream-response"
           ),
+          body: {},
           model: Stagehand::Models::SessionEndResponse,
           options: options
         )