Compile with golang-1.20

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.16 AS builder
+FROM golang:1.20 AS builder
 WORKDIR /src
 
 # avoid downloading the dependencies on succesive builds

go.mod

@@ -1,18 +1,48 @@
 module github.com/kumina/postfix_exporter
 
-go 1.16
+go 1.20
 
 require (
-	github.com/Microsoft/go-winio v0.5.0 // indirect
 	github.com/alecthomas/kingpin v2.2.6+incompatible
-	github.com/coreos/go-systemd/v22 v22.0.0
-	github.com/docker/distribution v2.7.1+incompatible // indirect
-	github.com/docker/docker v1.13.1
-	github.com/docker/go-connections v0.4.0 // indirect
-	github.com/docker/go-units v0.4.0 // indirect
+	github.com/coreos/go-systemd/v22 v22.5.0
+	github.com/docker/docker v24.0.2+incompatible
 	github.com/nxadm/tail v1.4.8
+	github.com/prometheus/client_golang v1.15.1
+	github.com/prometheus/client_model v0.4.0
+	github.com/stretchr/testify v1.8.4
+)
+
+require (
+	github.com/Microsoft/go-winio v0.6.1 // indirect
+	github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751 // indirect
+	github.com/alecthomas/units v0.0.0-20211218093645-b94a6e3cc137 // indirect
+	github.com/beorn7/perks v1.0.1 // indirect
+	github.com/cespare/xxhash/v2 v2.2.0 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/docker/distribution v2.8.2+incompatible // indirect
+	github.com/docker/go-connections v0.4.0 // indirect
+	github.com/docker/go-units v0.5.0 // indirect
+	github.com/fsnotify/fsnotify v1.4.9 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang/protobuf v1.5.3 // indirect
+	github.com/kr/text v0.2.0 // indirect
+	github.com/matttproud/golang_protobuf_extensions v1.0.4 // indirect
+	github.com/moby/term v0.5.0 // indirect
+	github.com/morikuni/aec v1.0.0 // indirect
 	github.com/opencontainers/go-digest v1.0.0 // indirect
-	github.com/prometheus/client_golang v1.4.1
-	github.com/prometheus/client_model v0.2.0
-	github.com/stretchr/testify v1.4.0
+	github.com/opencontainers/image-spec v1.0.2 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/prometheus/common v0.42.0 // indirect
+	github.com/prometheus/procfs v0.9.0 // indirect
+	github.com/rogpeppe/go-internal v1.10.0 // indirect
+	golang.org/x/mod v0.8.0 // indirect
+	golang.org/x/net v0.7.0 // indirect
+	golang.org/x/sys v0.6.0 // indirect
+	golang.org/x/time v0.3.0 // indirect
+	golang.org/x/tools v0.6.0 // indirect
+	google.golang.org/protobuf v1.30.0 // indirect
+	gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+	gotest.tools/v3 v3.4.0 // indirect
 )