Update dependency @nomiclabs/hardhat-solhint to v4

Author: renovate[bot]

package.json

@@ -24,7 +24,7 @@
   "devDependencies": {
     "@nomiclabs/hardhat-ethers": "^2.0.0",
     "@nomiclabs/hardhat-etherscan": "^3.0.0",
-    "@nomiclabs/hardhat-solhint": "^3.0.0",
+    "@nomiclabs/hardhat-solhint": "^4.0.0",
     "@nomiclabs/hardhat-waffle": "^2.0.0",
     "@openzeppelin/contracts": "^4.5.0",
     "@openzeppelin/contracts-upgradeable": "^4.5.2",