params, core/forkid: schedule cancun fork on goerli (#28719)

This PR schedules the cancun fork for the goerli testnet as discussed on ACD.
Spec: ethereum/execution-specs#860

We schedule:
  goerli at 1705473120

core/forkid/forkid_test.go

@@ -91,8 +91,10 @@ func TestCreation(t *testing.T) {
 				{5000000, 0, ID{Hash: checksumToBytes(0x757a1c47), Next: 5062605}},             // Last Berlin block
 				{5062605, 0, ID{Hash: checksumToBytes(0xB8C6299D), Next: 1678832736}},          // First London block
 				{6000000, 1678832735, ID{Hash: checksumToBytes(0xB8C6299D), Next: 1678832736}}, // Last London block
-				{6000001, 1678832736, ID{Hash: checksumToBytes(0xf9843abf), Next: 0}},          // First Shanghai block
+				{6000001, 1678832736, ID{Hash: checksumToBytes(0xf9843abf), Next: 1705473120}}, // First Shanghai block
-				{6500000, 2678832736, ID{Hash: checksumToBytes(0xf9843abf), Next: 0}},          // Future Shanghai block
+				{6500002, 1705473119, ID{Hash: checksumToBytes(0xf9843abf), Next: 1705473120}}, // Last Shanghai block
+				{6500003, 1705473120, ID{Hash: checksumToBytes(0x70cc14e2), Next: 0}},          // First Cancun block
+				{6500003, 2705473120, ID{Hash: checksumToBytes(0x70cc14e2), Next: 0}},          // Future Cancun block
 			},
 		},
 		// Sepolia test cases

params/config.go

@@ -127,6 +127,7 @@ var (
 		TerminalTotalDifficulty:       big.NewInt(10_790_000),
 		TerminalTotalDifficultyPassed: true,
 		ShanghaiTime:                  newUint64(1678832736),
+		CancunTime:                    newUint64(1705473120),
 		Clique: &CliqueConfig{
 			Period: 15,
 			Epoch:  30000,