Specify auto-project detection for PubSub.

In pubsub v1.32, a breaking change made it so specifying a blank project
results in an error, rather than automatically detecting the project as
it did before. Instead, specify the sentinel value for detecting the
project automatically.

See
https://github.com/googleapis/google-cloud-go/releases/tag/pubsub%2Fv1.32.0.

Note that an update a while back upgraded the pubsub module version from
v1.22.2 to v1.33.0.

cmd/summarizer/main.go

@@ -96,7 +96,7 @@ func gcsFixer(ctx context.Context, projectSub string, configPath gcs.Path, tabPr
 		return nil, errors.New("malformed project/subscription")
 	}
 	projID, subID := parts[0], parts[1]
-	pubsubClient, err := gpubsub.NewClient(ctx, "", option.WithCredentialsFile(credPath))
+	pubsubClient, err := gpubsub.NewClient(ctx, gpubsub.DetectProjectID, option.WithCredentialsFile(credPath))
 	if err != nil {
 		logrus.WithError(err).Fatal("Failed to create pubsub client")
 	}

cmd/tabulator/main.go

@@ -183,7 +183,7 @@ func gcsFixer(ctx context.Context, projectSub string, configPath gcs.Path, gridP
 		return nil, errors.New("malformed project/subscription")
 	}
 	projID, subID := parts[0], parts[1]
-	pubsubClient, err := gpubsub.NewClient(ctx, "", option.WithCredentialsFile(credPath))
+	pubsubClient, err := gpubsub.NewClient(ctx, gpubsub.DetectProjectID, option.WithCredentialsFile(credPath))
 	if err != nil {
 		logrus.WithError(err).Fatal("Failed to create pubsub client")
 	}

cmd/updater/main.go

@@ -215,7 +215,7 @@ func main() {
 
 	mets := updater.CreateMetrics(prometheus.NewFactory())
 
-	pubsubClient, err := gpubsub.NewClient(ctx, "", option.WithCredentialsFile(opt.creds))
+	pubsubClient, err := gpubsub.NewClient(ctx, gpubsub.DetectProjectID, option.WithCredentialsFile(opt.creds))
 	if err != nil {
 		logrus.WithError(err).Fatal("Failed to create pubsub client")
 	}