internal/vulndbreqs: use Go instead of TryGo

Otherwise, a go routine will be skipped if the limit is reached.

Change-Id: Ie5a4d7d31879f549678c00087b60d8904f77f234
Reviewed-on: https://go-review.googlesource.com/c/pkgsite-metrics/+/605435
Reviewed-by: Jonathan Amsterdam <jba@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

internal/vulndbreqs/compute.go

diff --git a/internal/vulndbreqs/compute.go b/internal/vulndbreqs/compute.go
index e26dbea..b757476 100644
--- a/internal/vulndbreqs/compute.go
+++ b/internal/vulndbreqs/compute.go
@@ -252,7 +252,7 @@
 	g.SetLimit(5)
 	for _, name := range objNames {
 		name := name
-		g.TryGo(func() error {
+		g.Go(func() error {
 			select {
 			case <-ctx.Done():
 				return nil // context cancelled, likely another routine erred