update megaeth v4 to canonical deployment (4326) (#80)

The megaeth-mainnet v4 subgraph was indexing the stale early deployment
(PoolManager 0x58dd83c317b03e6ebd72c3e912adf60a8e97aa95, ~block 3.63M).
Repoint to the canonical v4 deployment per
developers.uniswap.org/contracts/v4/deployments (chain 4326), confirmed
on-chain:

- networks.json PoolManager -> 0xacb7e78fa05d562e0a5d3089ec896d57d057d38e @ startBlock 7009653
- networks.json PositionManager -> 0x9ae0921e981aaa7308f176f8d4f9129b9247c89d @ startBlock 7009656
- chains.ts poolManagerAddress -> 0xacb7e78fa05d562e0a5d3089ec896d57d057d38e
- stablecoinWrappedNativePoolId left unchanged (verified still initialized on the
  canonical PoolManager via StateView.getSlot0)

Author: robert-seitz-uniswap

networks.json

@@ -203,12 +203,12 @@
   },
   "megaeth-mainnet": {
     "PoolManager": {
-      "address": "0x58dd83c317b03e6ebd72c3e912adf60a8e97aa95",
-      "startBlock": 3637446
+      "address": "0xacb7e78fa05d562e0a5d3089ec896d57d057d38e",
+      "startBlock": 7009653
     },
     "PositionManager": {
-      "address": "0xcae584c1f193cb3c090324ca8a1af4ce378e37e1",
-      "startBlock": 3637446
+      "address": "0x9ae0921e981aaa7308f176f8d4f9129b9247c89d",
+      "startBlock": 7009656
     }
   },
   "linea": {

src/utils/chains.ts

@@ -694,7 +694,7 @@ export function getSubgraphConfig(): SubgraphConfig {
     const nativeToUSDT0 = '0xf1fc7e1b96823086b3821db02223910112d139b28c6a132befccada2a3ecae89'.toLowerCase()
 
     return {
-      poolManagerAddress: '0x58dd83c317b03e6ebd72c3e912adf60a8e97aa95'.toLowerCase(),
+      poolManagerAddress: '0xacb7e78fa05d562e0a5d3089ec896d57d057d38e'.toLowerCase(),
       stablecoinWrappedNativePoolId: nativeToUSDT0,
       stablecoinIsToken0: false,
       wrappedNativeAddress: WETH,