Update go version

vendor/golang.org/x/tools/internal/modindex/index.go

@@ -10,7 +10,6 @@ import (
 	"encoding/csv"
 	"fmt"
 	"io"
-	"log"
 	"os"
 	"path/filepath"
 	"strconv"
@@ -107,14 +106,14 @@ var IndexDir string = func() string {
 		var err error
 		dir, err = os.UserCacheDir()
 		// shouldn't happen, but TempDir is better than
-		// creating ./go/imports
+		// creating ./goimports
 		if err != nil {
 			dir = os.TempDir()
 		}
 	}
 	dir = filepath.Join(dir, "goimports")
 	if err := os.MkdirAll(dir, 0777); err != nil {
-		log.Printf("failed to create modcache index dir: %v", err)
+		dir = "" // #75505, people complain about the error message
 	}
 	return dir
 }()
@@ -127,6 +126,9 @@ func Read(gomodcache string) (*Index, error) {
 	if err != nil {
 		return nil, err
 	}
+	if IndexDir == "" {
+		return nil, os.ErrNotExist
+	}
 
 	// Read the "link" file for the specified gomodcache directory.
 	// It names the payload file.
@@ -186,6 +188,9 @@ func readIndexFrom(gomodcache string, r io.Reader) (*Index, error) {
 	)
 	for scan.Scan() {
 		v := scan.Text()
+		if len(v) < 2 {
+			return nil, fmt.Errorf("malformed line: %q, %d entries", v, len(entries))
+		}
 		if v[0] == ':' {
 			if curEntry != nil {
 				entries = append(entries, *curEntry)
@@ -227,6 +232,9 @@ func readIndexFrom(gomodcache string, r io.Reader) (*Index, error) {
 
 // write writes the index file and updates the index directory to refer to it.
 func write(gomodcache string, ix *Index) error {
+	if IndexDir == "" {
+		return os.ErrNotExist
+	}
 	// Write the index into a payload file with a fresh name.
 	f, err := os.CreateTemp(IndexDir, fmt.Sprintf("index-%d-*", CurrentVersion))
 	if err != nil {

vendor/golang.org/x/tools/internal/modindex/modindex.go

@@ -73,7 +73,9 @@ func build(gomodcache string, old *Index) (*Index, bool, error) {
 	// Set the time window.
 	var start time.Time // = dawn of time
 	if old != nil {
-		start = old.ValidAt
+		// -1s to accommodate skew between (fine-grained) time.Now
+		// and (coarse) file system's mtime clock.
+		start = old.ValidAt.Add(-1 * time.Second)
 	}
 	now := time.Now()
 	end := now.Add(24 * time.Hour) // safely in the future