Bump to golang 1.20 to pick up go1.19.6 / go1.20.1 CVE fixes

Go 1.18 is already EOL and doesn't have fixes available.

Signed-off-by: Jingyuan Liang <jingyuanliang@google.com>

.github/workflows/test.yaml

@@ -4,7 +4,7 @@ name: test
 on: ["push", "pull_request"]
 
 env:
-  GO_VERSION: "1.18"
+  GO_VERSION: "1.20"
   LINUX_ARCHES: "amd64 386 arm arm64 s390x mips64le ppc64le riscv64"
 
 jobs:

go.mod

@@ -1,6 +1,6 @@
 module github.com/containernetworking/plugins
 
-go 1.18
+go 1.20
 
 require (
 	github.com/Microsoft/hcsshim v0.9.8

pkg/ns/ns_suite_test.go

@@ -15,7 +15,6 @@
 package ns_test
 
 import (
-	"math/rand"
 	"runtime"
 	"testing"
 
@@ -24,7 +23,6 @@ import (
 )
 
 func TestNs(t *testing.T) {
-	rand.Seed(GinkgoRandomSeed())
 	runtime.LockOSThread()
 
 	RegisterFailHandler(Fail)

plugins/main/tap/tap_test.go

@@ -17,7 +17,6 @@ package main
 import (
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
 	"net"
 	"os"
 	"strings"
@@ -179,7 +178,7 @@ var _ = Describe("Add, check, remove tap plugin", func() {
 		targetNS, err = testutils.NewNS()
 		Expect(err).NotTo(HaveOccurred())
 
-		dataDir, err = ioutil.TempDir("", "dummy")
+		dataDir, err = os.MkdirTemp("", "dummy")
 		Expect(err).NotTo(HaveOccurred())
 	})
 

plugins/meta/portmap/portmap_suite_test.go

@@ -15,7 +15,6 @@
 package main
 
 import (
-	"math/rand"
 	"net"
 	"os/exec"
 	"path/filepath"
@@ -32,8 +31,6 @@ import (
 )
 
 func TestPortmap(t *testing.T) {
-	rand.Seed(GinkgoRandomSeed())
-
 	RegisterFailHandler(Fail)
 	RunSpecs(t, "plugins/meta/portmap")
 }

scripts/release.sh

@@ -16,7 +16,7 @@ rm -Rf ${SRC_DIR}/${RELEASE_DIR}
 mkdir -p ${SRC_DIR}/${RELEASE_DIR}
 mkdir -p ${OUTPUT_DIR}
 
-$DOCKER run -ti -v ${SRC_DIR}:/go/src/github.com/containernetworking/plugins:z --rm golang:1.18-alpine \
+$DOCKER run -ti -v ${SRC_DIR}:/go/src/github.com/containernetworking/plugins:z --rm golang:1.20-alpine \
 /bin/sh -xe -c "\
     apk --no-cache add bash tar;
     cd /go/src/github.com/containernetworking/plugins; umask 0022;