cmd/govulncheck/integration/stackrox: update vuln expectation

This is due to new vuln db entry
https://go-review.git.corp.google.com/c/vulndb/+/550858.

Change-Id: I8859deab4b16c172dbc448946492937915536c9e
Reviewed-on: https://go-review.googlesource.com/c/vuln/+/551136
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Zvonimir Pavlinovic <zpavlinovic@google.com>
Reviewed-by: Maceo Thompson <maceothompson@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

cmd/govulncheck/integration/stackrox-scanner/scanner.go

@@ -23,6 +23,7 @@ func main() {
 	}
 	out := os.Args[1]
 	want := map[string]bool{
+		"golang.org/x/crypto/ssh":                   true,
 		"golang.org/x/net/http2":                    true,
 		"golang.org/x/net/http2/hpack":              true,
 		"google.golang.org/grpc":                    true,