Update dependency @nomiclabs/hardhat-ethers to v2.2.2

Author: renovate[bot]

package.json

@@ -18,7 +18,7 @@
 		"clean": "rimraf scripts/**/*.js build"
 	},
 	"devDependencies": {
-		"@nomiclabs/hardhat-ethers": "2.1.1",
+		"@nomiclabs/hardhat-ethers": "2.2.2",
 		"@nomiclabs/hardhat-etherscan": "3.1.0",
 		"@nomiclabs/hardhat-waffle": "2.0.3",
 		"@openzeppelin/hardhat-upgrades": "1.19.0",