random: stop using deprecated rand.Seed in go1.20 and later

lib/random/random.go

@@ -67,19 +67,3 @@ func Password(bits int) (password string, err error) {
 	password = base64.RawURLEncoding.EncodeToString(pw)
 	return password, nil
 }
-
-// Seed the global math/rand with crypto strong data
-//
-// This doesn't make it OK to use math/rand in crypto sensitive
-// environments - don't do that! However it does help to mitigate the
-// problem if that happens accidentally. This would have helped with
-// CVE-2020-28924 - #4783
-func Seed() error {
-	var seed int64
-	err := binary.Read(cryptorand.Reader, binary.LittleEndian, &seed)
-	if err != nil {
-		return fmt.Errorf("failed to read random seed: %w", err)
-	}
-	mathrand.Seed(seed)
-	return nil
-}