security: fix CVE-2022-1271 (#425)

Signed-off-by: Anish Ramasekar <anish.ramasekar@gmail.com>

docker/proxy-init.Dockerfile

@@ -1,7 +1,8 @@
 FROM --platform=${TARGETPLATFORM:-linux/amd64} k8s.gcr.io/build-image/debian-iptables:bullseye-v1.3.0
 
 # upgrading zlib1g due to CVE-2018-25032
-RUN clean-install ca-certificates zlib1g
+# upgrading gzip and liblzma5 due to CVE-2022-1271
+RUN clean-install ca-certificates zlib1g gzip liblzma5
 COPY ./init/init-iptables.sh /bin/
 RUN chmod +x /bin/init-iptables.sh
 # Kubernetes runAsNonRoot requires USER to be numeric