build: update deps

Author: lingcoder

contracts/Greeter.sol

@@ -1,5 +1,5 @@
 /* SPDX-License-Identifier: MIT */
-pragma solidity ^0.8.26;
+pragma solidity ^0.8.28;
 
 import { console } from "hardhat/console.sol";
 import { IGreeter } from "./interfaces/IGreeter.sol";

contracts/interfaces/IGreeter.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.26;
+pragma solidity ^0.8.28;
 
 /**
  * @title IGreeter

hardhat.config.ts

@@ -137,7 +137,7 @@ export default {
     flat: false,
   },
   solidity: {
-    version: "0.8.26",
+    version: "0.8.28",
     settings: {
       optimizer: {
         enabled: false,