Bump golang to 1.16.0 (#3386)

Release notes: https://golang.org/doc/go1.16

Signed-off-by: Sunjay Bhatia <sunjayb@vmware.com>

.github/workflows/prbuild.yaml

@@ -35,7 +35,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-go@v2
         with:
-          go-version: '1.15.8'
+          go-version: '1.16.0'
       - name: test
         run: |
           make install
@@ -50,7 +50,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-go@v2
         with:
-          go-version: '1.15.8'
+          go-version: '1.16.0'
       - name: test
         run: |
           make install
@@ -83,7 +83,7 @@ jobs:
       - uses: actions/checkout@v2
       - uses: actions/setup-go@v2
         with:
-          go-version: '1.15.8'
+          go-version: '1.16.0'
       - name: generate
         run: |
           make generate lint-yamllint lint-flags

CONTRIBUTING.md

@@ -17,7 +17,7 @@ This section describes how to build Contour from source.
 
 1. *Install Go*
 
-    Contour requires [Go 1.15][1] or later.
+    Contour requires [Go 1.16][1] or later.
     We also assume that you're familiar with Go's [`GOPATH` workspace][3] convention, and have the appropriate environment variables set.
 
 ### Fetch the source

Dockerfile

@@ -1,6 +1,6 @@
 ARG BUILDPLATFORM=linux/amd64
 
-FROM --platform=$BUILDPLATFORM golang:1.15.8 AS build
+FROM --platform=$BUILDPLATFORM golang:1.16.0 AS build
 WORKDIR /contour
 
 ENV GOPROXY=https://proxy.golang.org