fix(ifc): lower pragma

Author: Rubilmax

src/interfaces/AggregatorV3Interface.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.0;
+pragma solidity >=0.5.0;
 
 /// @dev From
 /// https://github.com/smartcontractkit/chainlink/blob/develop/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol.

src/interfaces/IChainlinkOracle.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
-pragma solidity ^0.8.0;
+pragma solidity >=0.5.0;
 
 import {IERC4626} from "./IERC4626.sol";
 import {AggregatorV3Interface} from "./AggregatorV3Interface.sol";

src/interfaces/IERC4626.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: GPL-2.0-or-later
-pragma solidity ^0.8.0;
+pragma solidity >=0.5.0;
 
 interface IERC4626 {
     function convertToAssets(uint256) external view returns (uint256);