VOL-3978 - update to go 1.16.3

Change-Id: Ifb1ca441ada40100f68ab31430eab357b1ab7f1f
diff --git a/build/package/Dockerfile b/build/package/Dockerfile
index 903433b..e808202 100644
--- a/build/package/Dockerfile
+++ b/build/package/Dockerfile
@@ -15,7 +15,7 @@
 # bbsim-sadis-server dockerfile
 
 # builder parent
-FROM golang:1.13.8-stretch as builder
+FROM golang:1.16.3-stretch as builder
 
 ENV CGO_ENABLED=1