Update repo promotion to use lib 6.7.4 (#4724)

Signed-off-by: Peter Zhu <[email protected]>

Author: peterzhuamazon

jenkins/promotion/promote-repos.jenkinsfile

@@ -7,7 +7,7 @@
  * compatible open source license.
  */
 
-lib = library(identifier: 'jenkins@2.0.2', retriever: modernSCM([
+lib = library(identifier: 'jenkins@6.4.7', retriever: modernSCM([
     $class: 'GitSCMSource',
     remote: 'https://github.com/opensearch-project/opensearch-build-libraries.git',
 ]))