Release ECS Service Connect Agent v1.27.3.0

The Envoy team released v1.27.3: https://github.com/envoyproxy/envoy/releases/tag/v1.27.3
Envoy version history: https://www.envoyproxy.io/docs/envoy/latest/version_history/v1.27/v1.27.3
App Mesh Envoy image release: aws/aws-app-mesh-roadmap#486

Provides fixes for the following Envoy CVEs:

• CVE-2024-23324
• CVE-2024-23325
• CVE-2024-23322
• CVE-2024-23323
• CVE-2024-23327

We update ECS Service Connect Agent to v1.27.3.0 together with App Mesh Envoy release.