Read the tested nats release from the server itself

The build seat's test binary listed no dependencies, so the check that the
image and the tests run one release failed on a release that matched.

modules/nats/cmd/nats-tools/server_test.go

@@ -7,7 +7,6 @@ import (
 	"net/http"
 	"os"
 	"regexp"
-	"runtime/debug"
 	"sync"
 	"testing"
 	"time"
@@ -28,19 +27,11 @@ func TestTheImageIsTheServerTestedHere(t *testing.T) {
 	if said == nil {
 		t.Fatal("the Dockerfile does not say which nats release its digest is (`# upstream: nats X.Y.Z-alpine`)")
 	}
-	info, ok := debug.ReadBuildInfo()
-	if !ok {
-		t.Fatal("no build information to read the tested server's version from")
+	// The server's own word for its release, compiled into it: a test binary's build information may list
+	// no dependencies (the build seat's did not, so this read "these tests run no nats-server").
+	if server.VERSION != string(said[1]) {
+		t.Fatalf("the image runs nats %s and these tests run %s: move them together", said[1], server.VERSION)
 	}
-	for _, dep := range info.Deps {
-		if dep.Path == "github.com/nats-io/nats-server/v2" {
-			if dep.Version != "v"+string(said[1]) {
-				t.Fatalf("the image runs nats %s and these tests run %s: move them together", said[1], dep.Version)
-			}
-			return
-		}
-	}
-	t.Fatal("these tests run no nats-server")
 }
 
 // **A consumer with several filters is handed every message** (novox/hq issue 266).