internal/sarif: remove unused field

Change-Id: I3b4139be32ce5fe03cbe19b135f186bd97e5a636
Reviewed-on: https://go-review.googlesource.com/c/vuln/+/576560
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Zvonimir Pavlinovic <zpavlinovic@google.com>
Reviewed-by: Maceo Thompson <maceothompson@google.com>

internal/sarif/handler.go

@@ -26,8 +26,6 @@ type handler struct {
 	// an osv is indeed called, then all findings for
 	// the osv will have call stack info.
 	findings map[string][]*govulncheck.Finding
-
-	binary bool
 }
 
 func NewHandler(w io.Writer) *handler {