chore(deps): update mcr.microsoft.com/azure-sdk/azure-mcp docker tag to v0.5.6

Author: renovate[bot]

registry/azure/spec.yaml

@@ -52,7 +52,7 @@ tags:
     - infrastructure
     - database
     - storage
-image: mcr.microsoft.com/azure-sdk/azure-mcp:0.5.1
+image: mcr.microsoft.com/azure-sdk/azure-mcp:0.5.6
 permissions:
     network:
         outbound: