vendor: update buildah to latest main

Includes one breaking change for the flag as BuildOutputs now accept a
slice.

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

vendor/github.com/containers/buildah/run_linux.go

@@ -543,6 +543,33 @@ rootless=%d
 
 	defer b.cleanupTempVolumes()
 
+	// Handle mount flags that request that the source locations for "bind" mountpoints be
+	// relabeled, and filter those flags out of the list of mount options we pass to the
+	// runtime.
+	for i := range spec.Mounts {
+		switch spec.Mounts[i].Type {
+		default:
+			continue
+		case "bind", "rbind":
+			// all good, keep going
+		}
+		zflag := ""
+		for _, opt := range spec.Mounts[i].Options {
+			if opt == "z" || opt == "Z" {
+				zflag = opt
+			}
+		}
+		if zflag == "" {
+			continue
+		}
+		spec.Mounts[i].Options = slices.DeleteFunc(spec.Mounts[i].Options, func(opt string) bool {
+			return opt == "z" || opt == "Z"
+		})
+		if err := relabel(spec.Mounts[i].Source, b.MountLabel, zflag == "z"); err != nil {
+			return fmt.Errorf("setting file label %q on %q: %w", b.MountLabel, spec.Mounts[i].Source, err)
+		}
+	}
+
 	switch isolation {
 	case define.IsolationOCI:
 		var moreCreateArgs []string
@@ -1139,16 +1166,19 @@ func (b *Builder) runSetupVolumeMounts(mountLabel string, volumeMounts []string,
 			if err := relabel(host, mountLabel, true); err != nil {
 				return specs.Mount{}, err
 			}
+			options = slices.DeleteFunc(options, func(o string) bool { return o == "z" })
 		}
 		if foundZ {
 			if err := relabel(host, mountLabel, false); err != nil {
 				return specs.Mount{}, err
 			}
+			options = slices.DeleteFunc(options, func(o string) bool { return o == "Z" })
 		}
 		if foundU {
 			if err := chown.ChangeHostPathOwnership(host, true, idMaps.processUID, idMaps.processGID); err != nil {
 				return specs.Mount{}, err
 			}
+			options = slices.DeleteFunc(options, func(o string) bool { return o == "U" })
 		}
 		if foundO {
 			if (upperDir != "" && workDir == "") || (workDir != "" && upperDir == "") {