Fix acceptance test handler to use string keys instead of symbols

Co-authored-by: GrantBirki <[email protected]>

Author: Copilot

spec/acceptance/plugins/handlers/team1_handler.rb

@@ -25,7 +25,7 @@ def call(payload:, headers:, config:)
 
     # Process the payload based on type
     if payload.is_a?(Hash)
-      event_type = payload[:event_type] || "unknown"
+      event_type = payload["event_type"] || "unknown"
 
       case event_type
       when "deployment"