VOL-3978 - update to go 1.16.3

Change-Id: I35e71c614f3e2e614f3103ad97ae70886478db23
diff --git a/Makefile b/Makefile
index f58cfe5..5a858c3 100644
--- a/Makefile
+++ b/Makefile
@@ -47,7 +47,7 @@
 RELEASE_OS_ARCH ?= linux-amd64 linux-arm64 windows-amd64 darwin-amd64
 
 # tool containers
-VOLTHA_TOOLS_VERSION ?= 2.0.0
+VOLTHA_TOOLS_VERSION ?= 2.4.0
 
 GO                = docker run --rm --user $$(id -u):$$(id -g) -v ${CURDIR}:/app $(shell test -t 0 && echo "-it") -v gocache:/.cache -v gocache-${VOLTHA_TOOLS_VERSION}:/go/pkg voltha/voltha-ci-tools:${VOLTHA_TOOLS_VERSION}-golang go
 GO_SH             = docker run --rm --user $$(id -u):$$(id -g) -v ${CURDIR}:/app $(shell test -t 0 && echo "-it") -v gocache:/.cache -v gocache-${VOLTHA_TOOLS_VERSION}:/go/pkg voltha/voltha-ci-tools:${VOLTHA_TOOLS_VERSION}-golang sh -c