fix(config): default back gas limit to 45M on mainnet (paradigmxyz#17690)

Author: 0xMushow

crates/node/core/src/cli/config.rs

@@ -7,6 +7,9 @@ use reth_network::{protocol::IntoRlpxSubProtocol, NetworkPrimitives};
 use reth_transaction_pool::PoolConfig;
 use std::{borrow::Cow, time::Duration};
 
+/// 45M gas limit
+const ETHEREUM_BLOCK_GAS_LIMIT_45M: u64 = 45_000_000;
+
 /// 60M gas limit
 const ETHEREUM_BLOCK_GAS_LIMIT_60M: u64 = 60_000_000;
 
@@ -42,9 +45,10 @@ pub trait PayloadBuilderConfig {
         }
 
         match chain.kind() {
-            ChainKind::Named(
-                NamedChain::Mainnet | NamedChain::Sepolia | NamedChain::Holesky | NamedChain::Hoodi,
-            ) => ETHEREUM_BLOCK_GAS_LIMIT_60M,
+            ChainKind::Named(NamedChain::Sepolia | NamedChain::Holesky | NamedChain::Hoodi) => {
+                ETHEREUM_BLOCK_GAS_LIMIT_60M
+            }
+            ChainKind::Named(NamedChain::Mainnet) => ETHEREUM_BLOCK_GAS_LIMIT_45M,
             _ => ETHEREUM_BLOCK_GAS_LIMIT_36M,
         }
     }