build(deps): bump github.com/envoyproxy/go-control-plane/envoy from 1.37.1-0.20260627225610-70ff85c381ff to 1.39.0 in /examples/sds-test-server

build(deps): bump github.com/envoyproxy/go-control-plane/envoy from 1.37.1-0.20260627225610-70ff85c381ff to 1.39.0 in /examples/sds-test-server #34598