refactor(tvix/nar-bridge): pass root node to storev1pb.Export

Bumps the go module past cl/9604 and update the consumer side.

Change-Id: Id44245017f1dc2f8aac28051cdbb45b83bdc5be3
Reviewed-on: https://cl.tvl.fyi/c/depot/+/9650
Reviewed-by: Brian McGee <brian@bmcgee.ie>
Tested-by: BuildkiteCI

tvix/nar-bridge/pkg/http/nar_get.go

@@ -95,7 +95,7 @@ func renderNar(
 	// render the NAR file
 	err := storev1pb.Export(
 		w,
-		pathInfo,
+		pathInfo.Node,
 		func(directoryDigest []byte) (*castorev1pb.Directory, error) {
 			log.WithField("directory", base64.StdEncoding.EncodeToString(directoryDigest)).Debug("Get directory")
 			directoryRefStr := hex.EncodeToString(directoryDigest)

tvix/nar-bridge/pkg/importer/roundtrip_test.go

@@ -59,7 +59,7 @@ func TestRoundtrip(t *testing.T) {
 	var buf bytes.Buffer
 	err = storev1pb.Export(
 		&buf,
-		pathInfo,
+		pathInfo.Node,
 		func(directoryDgst []byte) (*castorev1pb.Directory, error) {
 			d, found := directoriesMap[base64.StdEncoding.EncodeToString(directoryDgst)]
 			if !found {