chore: update to go1.20

.github/workflows/build.yaml

@@ -6,7 +6,7 @@ on:
       - '*'
 
 env:
-  GO_VERSION: 1.19
+  GO_VERSION: '1.20'
   CGO_ENABLED: 0
   IN_DOCKER: ""
 

.github/workflows/test-unit.yaml

@@ -6,7 +6,7 @@ on:
       - '*'
 
 env:
-  GO_VERSION: 1.19
+  GO_VERSION: '1.20'
   IN_DOCKER: ""
 
 jobs:

.github/workflows/validate.yaml

@@ -6,8 +6,8 @@ on:
       - '*'
 
 env:
-  GO_VERSION: 1.19
-  GOLANGCI_LINT_VERSION: v1.50.0
+  GO_VERSION: '1.20'
+  GOLANGCI_LINT_VERSION: v1.51.2
   MISSSPELL_VERSION: v0.4.0
   IN_DOCKER: ""
 

.semaphore/semaphore.yml

@@ -19,7 +19,7 @@ global_job_config:
   prologue:
     commands:
       - curl -sSfL https://raw.githubusercontent.com/ldez/semgo/master/godownloader.sh | sudo sh -s -- -b "/usr/local/bin"
-      - sudo semgo go1.19
+      - sudo semgo go1.20
       - export "GOPATH=$(go env GOPATH)"
       - export "SEMAPHORE_GIT_DIR=${GOPATH}/src/github.com/traefik/${SEMAPHORE_PROJECT_NAME}"
       - export "PATH=${GOPATH}/bin:${PATH}"

build.Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.19-alpine
+FROM golang:1.20-alpine
 
 RUN apk --no-cache --no-progress add git mercurial bash gcc musl-dev curl tar ca-certificates tzdata \
     && update-ca-certificates \

exp.Dockerfile

@@ -12,7 +12,7 @@ RUN yarn install
 RUN yarn build
 
 # BUILD
-FROM golang:1.19-alpine as gobuild
+FROM golang:1.20-alpine as gobuild
 
 RUN apk --no-cache --no-progress add git mercurial bash gcc musl-dev curl tar ca-certificates tzdata \
     && update-ca-certificates \

go.mod

@@ -1,6 +1,6 @@
 module github.com/traefik/traefik/v2
 
-go 1.19
+go 1.20
 
 require (
 	github.com/BurntSushi/toml v1.2.1

pkg/collector/collector.go

@@ -20,6 +20,8 @@ import (
 const collectorURL = "https://collect.traefik.io/9vxmmkcdmalbdi635d4jgc5p5rx0h7h8"
 
 // Collected data.
+//
+//nolint:musttag // cannot be changed for historical reasons.
 type data struct {
 	Version       string
 	Codename      string

pkg/middlewares/buffering/buffering_test.go

@@ -3,8 +3,8 @@ package buffering
 import (
 	"bytes"
 	"context"
+	"crypto/rand"
 	"math"
-	"math/rand"
 	"net/http"
 	"net/http/httptest"
 	"testing"
@@ -16,7 +16,7 @@ import (
 
 func TestBuffering(t *testing.T) {
 	payload := make([]byte, math.MaxInt8)
-	rand.Read(payload)
+	_, _ = rand.Read(payload)
 
 	testCases := []struct {
 		desc         string

script/codegen.Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:1.19
+FROM golang:1.20
 
 ARG USER=$USER
 ARG UID=$UID