upgrade: mainnet hardfork block height for: Plato, Hertz

Hertz is equal to Berlin and London

- Plato will be enabled on BSC mainnet at height: 30720096
- Hertz will be enabled on BSC mainnet at height: 31302048
  Hertz is for ecosystem compatibility, to enable some customized EIPs of Berlin&London on BSC

params/config.go

@@ -193,11 +193,11 @@ var (
 		// TODO modify blockNumber, make sure the blockNumber is not an integer multiple of 200 (epoch number)
 		// TODO Caution !!! it should be very careful !!!
 		LubanBlock: big.NewInt(29020050),
-		PlatoBlock: nil,
+		PlatoBlock: big.NewInt(30720096),
 		// TODO modify blockNumber, make sure HertzBlock=BerlinBlock=LondonBlock to enable Berlin and London EIPs
-		BerlinBlock: nil,
-		LondonBlock: nil,
-		HertzBlock:  nil,
+		BerlinBlock: big.NewInt(31302048),
+		LondonBlock: big.NewInt(31302048),
+		HertzBlock:  big.NewInt(31302048),
 
 		Parlia: &ParliaConfig{
 			Period: 3,