chore(host-contracts): bump reinitializer version in input/kms verifier contracts (#755)

Author: melanciani

host-contracts/contracts/InputVerifier.sol

@@ -119,7 +119,7 @@ contract InputVerifier is UUPSUpgradeableEmptyProxy, Ownable2StepUpgradeable, EI
 
     /// Constant used for making sure the version number used in the `reinitializer` modifier is
     /// identical between `initializeFromEmptyProxy` and the `reinitializeVX` method
-    uint64 private constant REINITIALIZER_VERSION = 2;
+    uint64 private constant REINITIALIZER_VERSION = 3;
 
     /// keccak256(abi.encode(uint256(keccak256("fhevm.storage.InputVerifier")) - 1)) & ~bytes32(uint256(0xff))
     bytes32 private constant InputVerifierStorageLocation =
@@ -153,6 +153,11 @@ contract InputVerifier is UUPSUpgradeableEmptyProxy, Ownable2StepUpgradeable, EI
         }
     }
 
+    /**
+     * @notice Re-initializes the contract from V1.
+     */
+    function reinitializeV2() public virtual reinitializer(REINITIALIZER_VERSION) {}
+
     /**
      * @dev This function removes the transient allowances, which could be useful for
             integration with Account Abstraction when bundling several UserOps calling InputVerifier.

host-contracts/contracts/KMSVerifier.sol

@@ -94,7 +94,7 @@ contract KMSVerifier is UUPSUpgradeableEmptyProxy, Ownable2StepUpgradeable, EIP7
 
     /// Constant used for making sure the version number used in the `reinitializer` modifier is
     /// identical between `initializeFromEmptyProxy` and the `reinitializeVX` method
-    uint64 private constant REINITIALIZER_VERSION = 2;
+    uint64 private constant REINITIALIZER_VERSION = 3;
 
     /// keccak256(abi.encode(uint256(keccak256("fhevm.storage.KMSVerifier")) - 1)) & ~bytes32(uint256(0xff))
     bytes32 private constant KMSVerifierStorageLocation =
@@ -124,6 +124,11 @@ contract KMSVerifier is UUPSUpgradeableEmptyProxy, Ownable2StepUpgradeable, EIP7
         defineNewContext(initialSigners, initialThreshold);
     }
 
+    /**
+     * @notice Re-initializes the contract from V1.
+     */
+    function reinitializeV2() public virtual reinitializer(REINITIALIZER_VERSION) {}
+
     /**
      * @notice          Sets a new context (i.e. new set of unique signers and new threshold).
      * @dev             Only the owner can set a new context.