Update OptimismPortal.sol

Co-authored-by: Matt Solomon <matt@mattsolomon.dev>

packages/contracts-bedrock/semver-lock.json

@@ -29,7 +29,7 @@
   },
   "src/L1/OptimismPortal.sol": {
     "initCodeHash": "0xc44238f1b97d7958baad77aea821de399cff040ab987c66946c1e3c6d6e20333",
-    "sourceCodeHash": "0x2530691be903b5903351791fb6b216dbddbd29eec4da4e4c2d882f571002b461"
+    "sourceCodeHash": "0x62908d2190dd0294ed4cde583e85233d8acfb118bae219957353746c5db3b4c3"
   },
   "src/L1/ProtocolVersions.sol": {
     "initCodeHash": "0x72cd467e8bcf019c02675d72ab762e088bcc9cc0f1a4e9f587fa4589f7fdd1b8",

packages/contracts-bedrock/src/L1/OptimismPortal.sol

@@ -61,7 +61,7 @@ contract OptimismPortal is Initializable, ResourceMetering, ISemver {
     /// @custom:legacy
     /// @custom:spacer paused
     /// @notice Spacer for backwards compatibility.
-    bool spacer_53_0_1;
+    bool private spacer_53_0_1;
 
     /// @notice The address of the Superchain Config contract.
     SuperchainConfig public superchainConfig;