feat(curriculum): add A1 Spanish warm-up audio describing people at work (freeCodeCamp#65790)

Author: estefaniacn

curriculum/schema/scene-assets.js

@@ -323,6 +323,7 @@ const availableAudios = [
   'ES_A1_vowels_aiu.mp3',
   'ES_A1_vowels_oiu.mp3',
   'ES_A1_vowels_uae.mp3',
+  'ES_A1_warm_up_describing_people_at_work.mp3',
   'ES_A1_what_the_company_does.mp3',
   'ZH_A1_greetings_and_introductions_wanghua.mp3',
   'ZH_A1_greetings_and_introductions_liuming.mp3',