Update c/image for https://github.com/containers/image/pull/912

This is an unreleased version of c/image, but it is important to
to have the test added in in the next commit enforcing as soon as
possible.

> go get github.com/containers/image/v5@HEAD
> make vendor

Signed-off-by: Miloslav Trmač <mitr@redhat.com>

vendor/github.com/vbauerster/mpb/v5/bar_filler.go

@@ -76,7 +76,7 @@ func (s *barFiller) SetReverse(reverse bool) {
 		s.flush = reverseFlush
 	} else {
 		s.tip = s.format[rTip]
-		s.flush = normalFlush
+		s.flush = regularFlush
 	}
 	s.reverse = reverse
 }
@@ -125,7 +125,7 @@ func (s *barFiller) Fill(w io.Writer, width int, stat *decor.Statistics) {
 	s.flush(w, bb)
 }
 
-func normalFlush(w io.Writer, bb [][]byte) {
+func regularFlush(w io.Writer, bb [][]byte) {
 	for i := 0; i < len(bb); i++ {
 		w.Write(bb[i])
 	}