support speech aws polly by role_arn (#729)

* support speech aws polly by role_arn

* support aws stt assume role

* wip

* update speech utils version

lib/utils/install-srf-locals.js

@@ -179,6 +179,7 @@ function installSrfLocals(srf, logger) {
     addFileToCache,
     getNuanceAccessToken,
     getIbmAccessToken,
+    getAwsAuthToken
   } = require('@jambonz/speech-utils')({}, logger);
   const {
     writeAlerts,
@@ -216,6 +217,7 @@ function installSrfLocals(srf, logger) {
       listCalls,
       deleteCall,
       synthAudio,
+      getAwsAuthToken,
       addFileToCache,
       createHash,
       retrieveHash,