chore: update debian-base image to buster-v1.3.0 (#74)

Dockerfile

@@ -1,8 +1,4 @@
-FROM us.gcr.io/k8s-artifacts-prod/build-image/debian-base-amd64:buster-v1.2.0
+FROM us.gcr.io/k8s-artifacts-prod/build-image/debian-base-amd64:buster-v1.3.0
 COPY ./_output/kubernetes-kms /bin/
-# upgrading apt &libapt-pkg5.0 due to CVE-2020-27350
-# upgrading libp11-kit0 due to CVE-2020-29362, CVE-2020-29363 and CVE-2020-29361
-RUN apt-mark unhold apt && \
-    clean-install ca-certificates apt libapt-pkg5.0 libp11-kit0 wget
 
 ENTRYPOINT [ "/bin/kubernetes-kms" ]