Run gopls modernize on codebase (#34751)

Recent modernize fixes:
https://github.com/golang/tools/commits/master/gopls/internal/analysis/modernize

cmd/cert.go

@@ -156,8 +156,8 @@ func runCert(_ context.Context, c *cli.Command) error {
 		BasicConstraintsValid: true,
 	}
 
-	hosts := strings.Split(c.String("host"), ",")
-	for _, h := range hosts {
+	hosts := strings.SplitSeq(c.String("host"), ",")
+	for h := range hosts {
 		if ip := net.ParseIP(h); ip != nil {
 			template.IPAddresses = append(template.IPAddresses, ip)
 		} else {

cmd/dump_repo.go

@@ -137,8 +137,8 @@ func runDumpRepository(ctx context.Context, cmd *cli.Command) error {
 		opts.PullRequests = true
 		opts.ReleaseAssets = true
 	} else {
-		units := strings.Split(cmd.String("units"), ",")
-		for _, unit := range units {
+		units := strings.SplitSeq(cmd.String("units"), ",")
+		for unit := range units {
 			switch strings.ToLower(strings.TrimSpace(unit)) {
 			case "":
 				continue

cmd/hook.go

@@ -480,7 +480,7 @@ func hookPrintResult(output, isCreate bool, branch, url string) {
 func pushOptions() map[string]string {
 	opts := make(map[string]string)
 	if pushCount, err := strconv.Atoi(os.Getenv(private.GitPushOptionCount)); err == nil {
-		for idx := 0; idx < pushCount; idx++ {
+		for idx := range pushCount {
 			opt := os.Getenv(fmt.Sprintf("GIT_PUSH_OPTION_%d", idx))
 			kv := strings.SplitN(opt, "=", 2)
 			if len(kv) == 2 {
@@ -732,7 +732,7 @@ func readPktLine(ctx context.Context, in *bufio.Reader, requestType pktLineType)
 
 	// read prefix
 	lengthBytes := make([]byte, 4)
-	for i := 0; i < 4; i++ {
+	for i := range 4 {
 		lengthBytes[i], err = in.ReadByte()
 		if err != nil {
 			return nil, fail(ctx, "Protocol: stdin error", "Pkt-Line: read stdin failed : %v", err)