Upgrade RDS DB cluster to 8.0.mysql_aurora.3.07.0

8.0.mysql_aurora.3.03.0 is reaching end of life on August 15, 2024. See https://docs.aws.amazon.com/AmazonRDS/latest/AuroraMySQLReleaseNotes/AuroraMySQL.Updates.30Updates.html

Signed-off-by: Hanwen <hanwenli@amazon.com>

Author: hanwen-cluster

cloudformation/database/serverless-database.yaml

@@ -268,7 +268,7 @@ Resources:
     Properties:
       DBClusterIdentifier: !Ref ClusterName
       Engine: "aurora-mysql"
-      EngineVersion: "8.0.mysql_aurora.3.03.0"
+      EngineVersion: "8.0"
       CopyTagsToSnapshot: true
       DBClusterParameterGroupName: !Ref AccountingClusterParameterGroup
       DBSubnetGroupName: !Ref AccountingClusterSubnetGroup