chore: updates from the lido-dao main branch

contracts/COMPILERS.md

@@ -2,17 +2,10 @@
 
 For Lido project coordination, governance and funds management we use [Aragon](https://aragon.org/dao), a well-developed and proven DAO Framework. The current stable release of its Kernel, [4.4.0](https://github.com/aragon/aragonOS/tree/v4.4.0) is fixed on the specific compiler version - [solc 0.4.24](https://solidity.readthedocs.io/en/v0.4.24/), that is currently outdated. Keeping security and consistency in mind, we decided to stay on an older yet proven combination - for all the contracts under Aragon management (`Lido`, `stETH`, `LegacyOracle`) we use solc 0.4.24 release.
 
-cstETH token, that acts as autonomous wrapper and not governed by Aragon, was inherited from OpenZeppelin's library, using one of its stable releases [3.1.0](https://github.com/OpenZeppelin/openzeppelin-contracts/releases/tag/v3.1.0).
+For the other contracts the newer compiler versions are used.
 
 # How to compile
 
-Separately:
-
-```bash
-yarn compile:4
-yarn compile:6
-```
-
 All at once:
 
 ```bash

contracts/common/interfaces/IGateSealFactory.sol

@@ -0,0 +1,20 @@
+// SPDX-FileCopyrightText: 2023 Lido <[email protected]>
+// SPDX-License-Identifier: GPL-3.0
+
+// See contracts/COMPILERS.md
+// solhint-disable-next-line
+pragma solidity >=0.4.24 <0.9.0;
+
+// https://github.com/lidofinance/gate-seals/blob/main/contracts/GateSealFactory.vy
+interface IGateSealFactory {
+
+    event GateSealCreated(address gate_seal);
+
+    function create_gate_seal(
+        address _sealing_committee,
+        uint256 _seal_duration_seconds,
+        address[] memory _sealables,
+        uint256 _expiry_timestamp
+    ) external;
+
+}

test/0.4.24/contracts/AccountingOracle__MockForLegacyOracle.sol

@@ -31,6 +31,7 @@ contract AccountingOracle__MockForLegacyOracle {
     }
 
     function submitReportData(AccountingOracle.ReportData calldata data, uint256 /* contractVersion */) external {
+        require(data.refSlot >= _lastRefSlot, "refSlot less than _lastRefSlot");
         uint256 slotsElapsed = data.refSlot - _lastRefSlot;
         _lastRefSlot = data.refSlot;