Revert "Temporarily pin ecs-service-connect-agent package to v1.29.12.1"

This reverts commit 0f7ac71.

Author: singholt

scripts/install-service-connect-appnet.sh

@@ -1,5 +1,4 @@
 #!/usr/bin/env bash
 set -ex
 
-# Temporarily pin to version 1.29.12.1 as latest available version 1.29.12.2 in Amazon Linux repos has a known issue.
-sudo yum install -y ecs-service-connect-agent-v1.29.12.1-*
+sudo yum install -y ecs-service-connect-agent