build: remove random.Seed since random generator is seeded automatically in go1.20

Now that the minimum version is go1.20 we can stop seeding the random
number generator.

cmd/cmd.go

@@ -39,7 +39,6 @@ import (
 	"github.com/rclone/rclone/lib/atexit"
 	"github.com/rclone/rclone/lib/buildinfo"
 	"github.com/rclone/rclone/lib/exitcode"
-	"github.com/rclone/rclone/lib/random"
 	"github.com/rclone/rclone/lib/terminal"
 	"github.com/spf13/cobra"
 	"github.com/spf13/pflag"
@@ -562,9 +561,6 @@ func AddBackendFlags() {
 
 // Main runs rclone interpreting flags and commands out of os.Args
 func Main() {
-	if err := random.Seed(); err != nil {
-		log.Fatalf("Fatal error: %v", err)
-	}
 	setupRootCommand(Root)
 	AddBackendFlags()
 	if err := Root.Execute(); err != nil {