Fix Execution Engine integration tests
## Proposed Changes
Recently, changes to Nethermind's Kiln branch have broken our integration tests.
This PR updates the chainspec to Kiln  to ensure proper compatibility.
@@ -43,7 +43,7 @@ pub fn geth_genesis_json() -> Value {
/// Sourced from:
///
-/// https://github.com/NethermindEth/nethermind/blob/themerge_kintsugi/src/Nethermind/Chains/themerge_kintsugi_m2.json
+/// https://github.com/NethermindEth/nethermind/blob/kiln/src/Nethermind/Chains/themerge_kiln_testvectors.json
pub fn nethermind_genesis_json() -> Value {
json!({
"name": "TheMerge_Devnet",
@@ -97,7 +97,7 @@ pub fn nethermind_genesis_json() -> Value {
"mixHash": "0x0000000000000000000000000000000000000000000000000000000000000000"
}
},
- "difficulty": "0x000000000",
+ "difficulty": "0x400000000",
"author": "0x0000000000000000000000000000000000000000",
"timestamp": "0x0",
"parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
