when using AWS for STT generate and use a session token

lib/utils/transcription-utils.js

@@ -491,7 +491,8 @@ module.exports = (logger) => {
         ...(sttCredentials && {
           AWS_ACCESS_KEY_ID: sttCredentials.accessKeyId,
           AWS_SECRET_ACCESS_KEY: sttCredentials.secretAccessKey,
-          AWS_REGION: sttCredentials.region
+          AWS_REGION: sttCredentials.region,
+          AWS_SESSION_TOKEN: sttCredentials.sessionToken
         }),
       };
     }