Add ProxyAdmin.transferOwnership to batch 1.

Fixes SEC-75.

packages/contracts-bedrock/scripts/multisig/CheckForBedrockMigration.s.sol

@@ -95,7 +95,7 @@ contract BedrockMigrationChecker is Script, StdAssertions {
 
     function checkL1ProxyAdmin(ContractSet memory contracts) internal {
         console2.log("Checking L1ProxyAdmin %s", contracts.L1ProxyAdmin);
-        checkAddressIsExpected(contracts.SystemDictatorProxy, contracts.L1ProxyAdmin, "owner()");
+        checkAddressIsExpected(contracts.L1UpgradeKey, contracts.L1ProxyAdmin, "owner()");
     }
 
     function checkL1StandardBridgeImpl(ContractSet memory contracts) internal {

packages/contracts-bedrock/scripts/multisig/json/mainnet-migration/b1.json

@@ -7,6 +7,25 @@
     "txBuilderVersion": "1.13.3"
   },
   "transactions": [
+    {
+      "to": "0x543bA4AADBAb8f9025686Bd03993043599c6fB04",
+      "value": "0",
+      "data": null,
+      "contractMethod": {
+        "inputs": [
+          {
+          "internalType": "address",
+          "name": "newOwner",
+          "type": "address"
+        }
+        ],
+        "name": "transferOwnership",
+        "payable": false
+      },
+      "contractInputsValues": {
+        "newOwner": "0xB4453CEb33d2e67FA244A24acf2E50CEF31F53cB"
+      }
+    },
     {
       "to": "0xdE1FCfB0851916CA5101820A69b13a4E276bd81F",
       "value": "0",