chore: update Solidity version to 0.8.30 (#80)

- Update pragma in ITrailsIntentEntrypoint.sol
- Update pragma in TrailsIntentEntrypoint.t.sol

Author: shunkakinoki

src/interfaces/ITrailsIntentEntrypoint.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.20;
+pragma solidity ^0.8.30;
 
 /// @title ITrailsIntentEntrypoint
 /// @notice Interface for the TrailsIntentEntrypoint contract

test/TrailsIntentEntrypoint.t.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.20;
+pragma solidity ^0.8.30;
 
 import {Test} from "forge-std/Test.sol";
 import {TrailsIntentEntrypoint} from "../src/TrailsIntentEntrypoint.sol";