Bump Go version to 1.17

Dockerfile

@@ -1,5 +1,5 @@
 # Build docker-gen from scratch
-FROM golang:1.16.7-alpine as go-builder
+FROM golang:1.17.1-alpine as go-builder
 
 ARG VERSION=main
 

go.mod

@@ -1,9 +1,39 @@
 module github.com/nginx-proxy/docker-gen
 
-go 1.16
+go 1.17
 
 require (
 	github.com/BurntSushi/toml v0.3.1
 	github.com/fsouza/go-dockerclient v1.7.2
 	github.com/stretchr/testify v1.7.0
 )
+
+require (
+	github.com/Azure/go-ansiterm v0.0.0-20170929234023-d6e3b3328b78 // indirect
+	github.com/Microsoft/go-winio v0.4.16 // indirect
+	github.com/Microsoft/hcsshim v0.8.14 // indirect
+	github.com/containerd/cgroups v0.0.0-20200531161412-0dbf7f05ba59 // indirect
+	github.com/containerd/containerd v1.4.3 // indirect
+	github.com/containerd/continuity v0.0.0-20210208174643-50096c924a4e // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/docker/docker v20.10.3-0.20210216175712-646072ed6524+incompatible // indirect
+	github.com/docker/go-connections v0.4.0 // indirect
+	github.com/docker/go-units v0.4.0 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/gorilla/mux v1.8.0 // indirect
+	github.com/hashicorp/golang-lru v0.5.1 // indirect
+	github.com/moby/sys/mount v0.2.0 // indirect
+	github.com/moby/sys/mountinfo v0.4.0 // indirect
+	github.com/moby/term v0.0.0-20201216013528-df9cb8a40635 // indirect
+	github.com/morikuni/aec v1.0.0 // indirect
+	github.com/opencontainers/go-digest v1.0.0 // indirect
+	github.com/opencontainers/image-spec v1.0.1 // indirect
+	github.com/opencontainers/runc v0.1.1 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/sirupsen/logrus v1.7.0 // indirect
+	go.opencensus.io v0.22.0 // indirect
+	golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9 // indirect
+	golang.org/x/sys v0.0.0-20210216224549-f992740a1bac // indirect
+	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c // indirect
+)