upgrade alpine base image v3.11 -> v3.13.4

Dockerfile

@@ -1,7 +1,7 @@
-FROM alpine:3.11
+FROM alpine:3.13.4
 
-ARG DUMB_INIT_PACKAGE_VERSION=1.2.2-r1
-ARG NETCAT_PACKAGE_VERSION=1.130-r1
+ARG DUMB_INIT_PACKAGE_VERSION=1.2.5-r0
+ARG NETCAT_PACKAGE_VERSION=1.130-r2
 ARG DMA_REPOSITORY=http://dl-cdn.alpinelinux.org/alpine/edge/testing
 ARG DMA_PACKAGE_VERSION=0.13-r1
 RUN apk add --no-cache \