add categorisation_sqs_url to serverless environment variables

serverless.yml

@@ -30,6 +30,8 @@ provider:
     GOOGLE_SOLAR_API_KEY: ${env:GOOGLE_SOLAR_API_KEY}
     ENGINE_SQS_URL:
       Ref: EngineQueue
+    # hardcode the categorisation queue for now as it's created in terraform
+    CATEGORISATION_SQS_URL: https://sqs.eu-west-2.amazonaws.com/337213553626/categorisation-queue-dev
 
 plugins:
   - serverless-python-requirements