Merge pull request #2513 from thaJeztah/bump_golang_1.12.17

Dockerfile: update to Golang 1.12.17

libnetwork/Dockerfile

@@ -1,4 +1,4 @@
-ARG GO_VERSION=1.12.12
+ARG GO_VERSION=1.12.17
 
 FROM golang:${GO_VERSION}-buster as dev
 RUN apt-get update && apt-get -y install iptables \