Update to go1.16.3

Author: mhagger

go.mod

@@ -1,6 +1,6 @@
 module github.com/github/git-sizer
 
-go 1.13
+go 1.16
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect

script/ensure-go-installed.sh

@@ -4,17 +4,17 @@ if [ -z "$ROOTDIR" ]; then
     echo 1>&2 'ensure-go-installed.sh invoked without ROOTDIR set!'
 fi
 
-# Is go installed, and at least 1.13?
+# Is go installed, and at least 1.16?
 go_ok() {
     set -- $(go version 2>/dev/null |
                 sed -n 's/.*go\([0-9][0-9]*\)\.\([0-9][0-9]*\).*/\1 \2/p' |
                 head -n 1)
-    [ $# -eq 2 ] && [ "$1" -eq 1 ] && [ "$2" -ge 13 ]
+    [ $# -eq 2 ] && [ "$1" -eq 1 ] && [ "$2" -ge 16 ]
 }
 
 # If a local go is installed, use it.
 set_up_vendored_go() {
-    GO_VERSION=go1.13.4
+    GO_VERSION=go1.16.3
     VENDORED_GOROOT="$ROOTDIR/vendor/$GO_VERSION/go"
     if [ -x "$VENDORED_GOROOT/bin/go" ]; then
         export GOROOT="$VENDORED_GOROOT"

script/install-vendored-go

@@ -1,14 +1,14 @@
 #!/bin/sh
 
 # The checksums below must correspond to the downloads for this version.
-GO_VERSION=go1.13.4
+GO_VERSION=go1.16.3
 
 if [ $(uname -s) = "Darwin" ]; then
     GO_PKG=${GO_VERSION}.darwin-amd64.tar.gz
-    GO_PKG_SHA=9f0721551a24a1eb43d2005cd58bd7b17574e50384b8da8896b0754259790752
+    GO_PKG_SHA=f4e96bbcd5d2d1942f5b55d9e4ab19564da4fad192012f6d7b0b9b055ba4208f
 elif [ $(uname -s) = "Linux" ]; then
     GO_PKG=${GO_VERSION}.linux-amd64.tar.gz
-    GO_PKG_SHA=692d17071736f74be04a72a06dab9cac1cd759377bd85316e52b2227604c004c
+    GO_PKG_SHA=951a3c7c6ce4e56ad883f97d9db74d3d6d80d5fec77455c6ada6c1f7ac4776d2
 else
     echo 1>&2 "I don't know how to install Go on your platform."
     echo 1>&2 "Please install $GO_VERSION or later and add it to your PATH."