Update buildkite-agent-scaler to v1.3.1

Author: Kwong Chong

templates/aws-stack.yml

@@ -1186,7 +1186,7 @@ Resources:
     Properties:
       Location:
         ApplicationId: arn:aws:serverlessrepo:us-east-1:172840064832:applications/buildkite-agent-scaler
-        SemanticVersion: '1.1.3'
+        SemanticVersion: '1.3.1'
       Parameters:
         BuildkiteAgentTokenParameter: !If [ UseCustomerManagedParameterPath, !Ref BuildkiteAgentTokenParameterStorePath, !Ref BuildkiteAgentTokenParameter ]
         BuildkiteAgentTokenParameterStoreKMSKey: !If [ UseCustomerManagedKeyForParameterStore, !Ref BuildkiteAgentTokenParameterStoreKMSKey, "" ]