update golangci-lint and replace deprecated calls to io/ioutil

utils/copyfile_test.go

@@ -1,7 +1,6 @@
 package utils
 
 import (
-	"io/ioutil"
 	"os"
 	"path/filepath"
 
@@ -16,7 +15,7 @@ type CopyfileSuite struct {
 var _ = Suite(&CopyfileSuite{})
 
 func (s *CopyfileSuite) SetUpSuite(c *C) {
-	s.source, _ = ioutil.TempFile(c.MkDir(), "source-file")
+	s.source, _ = os.CreateTemp(c.MkDir(), "source-file")
 	s.dest = filepath.Join(filepath.Dir(s.source.Name()), "destination-file")
 }