spec_helper: Handle AWS_REGION consistently

Author: arnodirlam

spec/spec_helper.rb

@@ -119,7 +119,7 @@
 
       config.bedrock_api_key = ENV.fetch('AWS_ACCESS_KEY_ID', 'test')
       config.bedrock_secret_key = ENV.fetch('AWS_SECRET_ACCESS_KEY', 'test')
-      config.bedrock_region = 'us-west-2'
+      config.bedrock_region = ENV.fetch('AWS_REGION', 'us-west-2')
       config.bedrock_session_token = ENV.fetch('AWS_SESSION_TOKEN', nil)
 
       config.request_timeout = 240