Envoy: Update to Envoy 1.13.2

[ upstream commit 6530325 ]

Update proxy image to build with Envoy 1.13.2. This fixes
CVE-2020-11080 by rejecting HTTP/2 SETTINGS frames with too many
parameters.

Signed-off-by: Jarno Rajahalme <jarno@covalent.io>

Dockerfile

@@ -1,7 +1,7 @@
 #
 # cilium-envoy from github.com/cilium/proxy
 #
-FROM quay.io/cilium/cilium-envoy:63de0bd958d05d82e2396125dcf6286d92464c56 as cilium-envoy
+FROM quay.io/cilium/cilium-envoy:a8f292139e923b205525feb2c8a4377005904776 as cilium-envoy
 
 #
 # Cilium incremental build. Should be fast given builder-deps is up-to-date!