Update_Dependencies (istio#1179)

Automatic merge from submit-queue.

[DO NOT MERGE] Auto PR to update dependencies of istio

This PR will be merged automatically once checks are successful.
```release-note
none
```

Former-commit-id: bb0b102

istio.VERSION

@@ -7,10 +7,10 @@ export MIXER_TAG="1b1e7205023b95604218b55c42c565e7d704a0f4"
 export PILOT_HUB="gcr.io/istio-testing"
 export PILOT_TAG="1ab60bb736f1ed072d4ef5941f80c63c766c3b32"
 export ISTIOCTL_URL="https://storage.googleapis.com/istio-artifacts/pilot/1ab60bb736f1ed072d4ef5941f80c63c766c3b32/artifacts/istioctl"
-export PROXY_TAG="1509b9361c3e727b40146dcddd44ed0012b7de78"
+export PROXY_TAG="51c2d7963f339afdf899e65207b44d1b370a06ec"
 export ISTIO_NAMESPACE="istio-system"
 export AUTH_DEBIAN_URL="https://storage.googleapis.com/istio-artifacts/auth/286039fb42378be91e05f0a8ba8b93b31c9cde57/artifacts/debs"
 export PILOT_DEBIAN_URL="https://storage.googleapis.com/istio-artifacts/pilot/1ab60bb736f1ed072d4ef5941f80c63c766c3b32/artifacts/debs"
-export PROXY_DEBIAN_URL="https://storage.googleapis.com/istio-artifacts/proxy/1509b9361c3e727b40146dcddd44ed0012b7de78/artifacts/debs"
+export PROXY_DEBIAN_URL="https://storage.googleapis.com/istio-artifacts/proxy/51c2d7963f339afdf899e65207b44d1b370a06ec/artifacts/debs"
 export FORTIO_HUB="gcr.io/istio-testing"
 export FORTIO_TAG="0.2.7"

istio.deps

@@ -25,6 +25,6 @@
 		"repoName": "proxy",
 		"prodBranch": "master",
 		"file": "istio.VERSION",
-		"lastStableSHA": "1509b9361c3e727b40146dcddd44ed0012b7de78"
+		"lastStableSHA": "51c2d7963f339afdf899e65207b44d1b370a06ec"
 	}
 ]