Fix deprecation message for connection pool methods

This deprecation was added in main as of 7.1 so the message shouldn't
mention 7.1, it should mention the next version of Rails.

activerecord/lib/active_record/connection_adapters/abstract/connection_handler.rb

@@ -292,7 +292,7 @@ def deprecation_for_pool_handling(method)
           if roles.flatten.uniq.count > 1
             ActiveRecord.deprecator.warn(<<-MSG.squish)
               `#{method}` currently only applies to connection pools in the current
-              role (`#{ActiveRecord::Base.current_role}`). In Rails 7.1, this method
+              role (`#{ActiveRecord::Base.current_role}`). In Rails 7.2, this method
               will apply to all known pools, regardless of role. To affect only those
               connections belonging to a specific role, pass the role name as an
               argument. To switch to the new behavior, pass `:all` as the role name.