fix(dhcp): can not renew an ip address

The dhcp server is systemd-networkd, and the dhcp
plugin can request an ip but can not renew it.
The systemd-networkd just ignore the renew request.

```
2024/09/14 21:46:00 no DHCP packet received within 10s
2024/09/14 21:46:00 retrying in 31.529038 seconds
2024/09/14 21:46:42 no DHCP packet received within 10s
2024/09/14 21:46:42 retrying in 63.150490 seconds
2024/09/14 21:47:45 98184616c91f15419f5cacd012697f85afaa2daeb5d3233e28b0ec21589fb45a/iot/eth1: no more tries
2024/09/14 21:47:45 98184616c91f15419f5cacd012697f85afaa2daeb5d3233e28b0ec21589fb45a/iot/eth1: renewal time expired, rebinding
2024/09/14 21:47:45 Link "eth1" down. Attempting to set up
2024/09/14 21:47:45 98184616c91f15419f5cacd012697f85afaa2daeb5d3233e28b0ec21589fb45a/iot/eth1: lease rebound, expiration is 2024-09-14 22:47:45.309270751 +0800 CST m=+11730.048516519
```

Follow the https://datatracker.ietf.org/doc/html/rfc2131#section-4.3.6,
following options must not be sent in renew

- Requested IP Address
- Server Identifier

Since the upstream code has been inactive for 6 years,
we should switch to another dhcpv4 library.
The new selected one is https://github.com/insomniacslk/dhcp.

Signed-off-by: Songmin Li <lisongmin@protonmail.com>

vendor/github.com/insomniacslk/dhcp/dhcpv4/option_generic.go

@@ -0,0 +1,27 @@
+package dhcpv4
+
+import (
+	"fmt"
+)
+
+// OptionGeneric is an option that only contains the option code and associated
+// data. Every option that does not have a specific implementation will fall
+// back to this option.
+type OptionGeneric struct {
+	Data []byte
+}
+
+// ToBytes returns a serialized generic option as a slice of bytes.
+func (o OptionGeneric) ToBytes() []byte {
+	return o.Data
+}
+
+// String returns a human-readable representation of a generic option.
+func (o OptionGeneric) String() string {
+	return fmt.Sprintf("%v", o.Data)
+}
+
+// OptGeneric returns a generic option.
+func OptGeneric(code OptionCode, value []byte) Option {
+	return Option{Code: code, Value: OptionGeneric{value}}
+}