fix: prevent decoding U256 TxValue on mainnet (#5344)

crates/primitives/src/transaction/tx_value.rs

@@ -44,8 +44,15 @@ impl Encodable for TxValue {
 impl Decodable for TxValue {
     #[inline]
     fn decode(buf: &mut &[u8]) -> Result<Self, Error> {
+        #[cfg(feature = "optimism")]
+        {
             U256::decode(buf).map(Self)
         }
+        #[cfg(not(feature = "optimism"))]
+        {
+            u128::decode(buf).map(Self::from)
+        }
+    }
 }
 
 /// As ethereum circulation on mainnet is around 120mil eth as of 2022 that is around