feat(protocol): upgrade to use OZ 4.9.6

packages/protocol/contracts/L1/gov/TaikoGovernor.sol

@@ -1,22 +1,19 @@
 // SPDX-License-Identifier: MIT
 pragma solidity 0.8.24;
 
-import "@openzeppelin/contracts-upgradeable/governance/GovernorUpgradeable.sol";
 import
     "@openzeppelin/contracts-upgradeable/governance/compatibility/GovernorCompatibilityBravoUpgradeable.sol";
-import "@openzeppelin/contracts-upgradeable/governance/extensions/GovernorVotesUpgradeable.sol";
 import
     "@openzeppelin/contracts-upgradeable/governance/extensions/GovernorVotesQuorumFractionUpgradeable.sol";
 import
     "@openzeppelin/contracts-upgradeable/governance/extensions/GovernorTimelockControlUpgradeable.sol";
-import "../../common/EssentialContract.sol";
+import "@openzeppelin/contracts-upgradeable/access/Ownable2StepUpgradeable.sol";
 
 /// @title TaikoGovernor
 /// @custom:security-contact security@taiko.xyz
 contract TaikoGovernor is
-    EssentialContract,
+    Ownable2StepUpgradeable,
     GovernorCompatibilityBravoUpgradeable,
-    GovernorVotesUpgradeable,
     GovernorVotesQuorumFractionUpgradeable,
     GovernorTimelockControlUpgradeable
 {
@@ -36,9 +33,8 @@ contract TaikoGovernor is
         external
         initializer
     {
-        __Essential_init(_owner);
+        _transferOwnership(_owner == address(0) ? msg.sender : _owner);
         __Governor_init("TaikoGovernor");
-        __GovernorCompatibilityBravo_init();
         __GovernorVotes_init(_token);
         __GovernorVotesQuorumFraction_init(4);
         __GovernorTimelockControl_init(_timelock);
@@ -58,33 +54,6 @@ contract TaikoGovernor is
         return super.propose(_targets, _values, _calldatas, _description);
     }
 
-    /// @notice An overwrite of GovernorCompatibilityBravoUpgradeable's propose() as that one does
-    /// not check that the length of signatures equal the calldata.
-    /// @dev See vulnerability description here:
-    /// https://github.com/taikoxyz/taiko-mono/security/dependabot/114
-    /// See fix in OZ 4.8.3 here (URL broken down for readability):
-    /// https://github.com/OpenZeppelin/openzeppelin-contracts/blob/
-    /// 0a25c1940ca220686588c4af3ec526f725fe2582/contracts/governance/compatibility/GovernorCompatibilityBravo.sol#L72
-    /// See {GovernorCompatibilityBravoUpgradeable-propose}
-    function propose(
-        address[] memory _targets,
-        uint256[] memory _values,
-        string[] memory _signatures,
-        bytes[] memory _calldatas,
-        string memory _description
-    )
-        public
-        virtual
-        override(GovernorCompatibilityBravoUpgradeable)
-        returns (uint256)
-    {
-        if (_signatures.length != _calldatas.length) revert TG_INVALID_SIGNATURES_LENGTH();
-
-        return GovernorCompatibilityBravoUpgradeable.propose(
-            _targets, _values, _signatures, _calldatas, _description
-        );
-    }
-
     /// @dev See {GovernorUpgradeable-supportsInterface}
     function supportsInterface(bytes4 _interfaceId)
         public
@@ -124,6 +93,23 @@ contract TaikoGovernor is
         return 1_000_000_000 ether / 10_000; // 0.01% of Taiko Token
     }
 
+    /// @dev Cancel a proposal with GovernorBravo logic.
+    function cancel(
+        address[] memory targets,
+        uint256[] memory values,
+        bytes[] memory calldatas,
+        bytes32 descriptionHash
+    )
+        public
+        virtual
+        override(IGovernorUpgradeable, GovernorUpgradeable, GovernorCompatibilityBravoUpgradeable)
+        returns (uint256)
+    {
+        return GovernorCompatibilityBravoUpgradeable.cancel(
+            targets, values, calldatas, descriptionHash
+        );
+    }
+
     function _execute(
         uint256 _proposalId,
         address[] memory _targets,

packages/protocol/package.json

@@ -35,8 +35,8 @@
     "typescript": "^5.2.2"
   },
   "dependencies": {
-    "@openzeppelin/contracts": "4.8.2",
-    "@openzeppelin/contracts-upgradeable": "4.8.2",
+    "@openzeppelin/contracts": "4.9.6",
+    "@openzeppelin/contracts-upgradeable": "4.9.6",
     "ds-test": "github:dapphub/ds-test#e282159d5170298eb2455a6c05280ab5a73a4ef0",
     "forge-std": "github:foundry-rs/forge-std#v1.7.5",
     "merkletreejs": "^0.3.11",

packages/protocol/test/L1/gov/TaikoGovernor.t.sol

@@ -99,11 +99,6 @@ contract TestTaikoGovernor is TaikoL1TestBase {
             true,
             "Incorrect supports interface"
         );
-        assertEq(
-            taikoGovernor.supportsInterface(type(IGovernorUpgradeable).interfaceId),
-            true,
-            "Incorrect supports interface"
-        );
         assertEq(
             taikoGovernor.supportsInterface(type(IERC1155ReceiverUpgradeable).interfaceId),
             true,