Update buildkit w/ customizable output colors, etc.

Signed-off-by: Sean P. Kane <spkane00@gmail.com>

vendor/github.com/moby/buildkit/util/progress/progressui/display.go

@@ -108,6 +108,7 @@ type job struct {
 	name        string
 	status      string
 	hasError    bool
+	hasWarning  bool // This is currently unused, but it's here for future use.
 	isCanceled  bool
 	vertex      *vertex
 	showTerm    bool
@@ -829,8 +830,13 @@ func (disp *display) print(d displayInfo, width, height int, all bool) {
 				color = colorCancel
 			} else if j.hasError {
 				color = colorError
+			} else if j.hasWarning {
+				// This is currently unused, but it's here for future use.
+				color = colorWarning
+			}
+			if color != nil {
+				out = aec.Apply(out, color)
 			}
-			out = aec.Apply(out, color)
 		}
 		fmt.Fprint(disp.c, out)
 		lineCount++