Prep for Release 9.4 (#5965)

Author: shashank-elastic

.github/workflows/lock-versions.yml

@@ -6,7 +6,7 @@ on:
           description: 'List of branches to lock versions (ordered, comma separated)'
           required: true
           # 7.17 was intentionally skipped because it was added late and was bug fix only
-          default: '8.19,9.1,9.2,9.3'
+          default: '8.19,9.2,9.3,9.4'
 
 jobs:
   pr: