chore: require go >=1.18, bump deps and get rid of replace directives (#1552)

pkg/transformer/kubernetes/k8sutils.go

@@ -20,7 +20,6 @@ import (
 	"bytes"
 	"encoding/json"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path"
 	"path/filepath"
@@ -79,7 +78,7 @@ func generateHelm(dirName string) error {
 
 	/* Create the readme file */
 	readme := "This chart was created by Kompose\n"
-	err = ioutil.WriteFile(dirName+string(os.PathSeparator)+"README.md", []byte(readme), 0644)
+	err = os.WriteFile(dirName+string(os.PathSeparator)+"README.md", []byte(readme), 0644)
 	if err != nil {
 		return err
 	}
@@ -102,7 +101,7 @@ home:
 	var chartData bytes.Buffer
 	_ = t.Execute(&chartData, details)
 
-	err = ioutil.WriteFile(dirName+string(os.PathSeparator)+"Chart.yaml", chartData.Bytes(), 0644)
+	err = os.WriteFile(dirName+string(os.PathSeparator)+"Chart.yaml", chartData.Bytes(), 0644)
 	if err != nil {
 		return err
 	}
@@ -839,7 +838,7 @@ func GetEnvsFromFile(file string, opt kobject.ConvertOptions) (map[string]string
 
 // GetContentFromFile gets the content from the file..
 func GetContentFromFile(file string) (string, error) {
-	fileBytes, err := ioutil.ReadFile(file)
+	fileBytes, err := os.ReadFile(file)
 	if err != nil {
 		return "", errors.Wrap(err, "Unable to read file")
 	}

pkg/transformer/kubernetes/kubernetes.go

@@ -19,7 +19,6 @@ package kubernetes
 import (
 	"encoding/base64"
 	"fmt"
-	"io/ioutil"
 	"os"
 	"path"
 	"path/filepath"
@@ -267,7 +266,7 @@ func (k *Kubernetes) IntiConfigMapFromFileOrDir(name, cmName, filePath string, s
 
 	switch mode := fi.Mode(); {
 	case mode.IsDir():
-		files, err := ioutil.ReadDir(filePath)
+		files, err := os.ReadDir(filePath)
 		if err != nil {
 			return nil, err
 		}

pkg/transformer/utils.go

@@ -18,7 +18,6 @@ package transformer
 
 import (
 	"fmt"
-	"io/ioutil"
 	"os"
 	"os/exec"
 	"path"
@@ -290,7 +289,7 @@ func Print(name, path string, trailing string, data []byte, toStdout, generateJS
 	} else {
 		// Write content separately to each file
 		file = filepath.Join(path, file)
-		if err := ioutil.WriteFile(file, data, 0644); err != nil {
+		if err := os.WriteFile(file, data, 0644); err != nil {
 			return "", errors.Wrap(err, "Failed to write %s: "+trailing)
 		}
 		log.Printf("%s file %q created", formatProviderName(provider), file)