Update go version

vendor/golang.org/x/tools/cmd/goimports/goimports.go

@@ -19,6 +19,7 @@ import (
 	"runtime"
 	"runtime/pprof"
 	"strings"
+	"testing"
 
 	"golang.org/x/telemetry/counter"
 	"golang.org/x/tools/internal/gocommand"
@@ -199,7 +200,8 @@ func walkDir(path string) {
 }
 
 func main() {
-	// is anyone using this command?
+	// Measure how many people still use goimports.
+	// (See https://go.dev/issue/78671 for one.)
 	counter.Open()
 	counter.Inc("tools/cmd:goimports")
 	runtime.GOMAXPROCS(runtime.NumCPU())
@@ -208,7 +210,9 @@ func main() {
 	// so that it can use defer and have them
 	// run before the exit.
 	gofmtMain()
-	os.Exit(exitCode)
+	if !testing.Testing() {
+		os.Exit(exitCode)
+	}
 }
 
 // parseFlags parses command line flags and returns the paths to process.