internal/flags: update copyright year to 2024 (#28760)

Co-authored-by: Felix Lange <fjl@twurst.com>

internal/flags/helpers.go

@@ -41,7 +41,7 @@ func NewApp(usage string) *cli.App {
 	app.EnableBashCompletion = true
 	app.Version = params.VersionWithCommit(git.Commit, git.Date)
 	app.Usage = usage
-	app.Copyright = "Copyright 2013-2023 The go-ethereum Authors"
+	app.Copyright = "Copyright 2013-2024 The go-ethereum Authors"
 	app.Before = func(ctx *cli.Context) error {
 		MigrateGlobalFlags(ctx)
 		return nil