curieproxy-envoy: update to v1.21.1
Istio 1.13.2 also uses envoy 1.21.1.
ARG RUSTBIN_TAG=latest
FROM curiefense/curiefense-rustbuild-bionic:${RUSTBIN_TAG} AS rustbin
-FROM curiefense/envoy-cf:0250ad715e8c0463d0d4389cbfab340bc7dd7587 AS envoy-cf
-FROM envoyproxy/envoy:v1.16.5
+FROM curiefense/envoy-cf:15d1607b3035c900ea943ac8e1fed6f15598a46b AS envoy-cf
+FROM envoyproxy/envoy:v1.21.1
RUN apt-get update && \
apt-get -qq -y --no-install-recommends install jq luarocks libpcre2-dev libgeoip-dev \
