Update dependency @nomiclabs/hardhat-ethers to v2.2.1

Author: renovate[bot]

package.json

@@ -16,7 +16,7 @@
 		"contracts/interfaces"
 	],
 	"devDependencies": {
-		"@nomiclabs/hardhat-ethers": "2.1.1",
+		"@nomiclabs/hardhat-ethers": "2.2.1",
 		"@nomiclabs/hardhat-waffle": "2.0.3",
 		"@types/chai": "4.3.4",
 		"@types/dotenv": "8.2.0",

yarn.lock

@@ -608,10 +608,10 @@
     "@nodelib/fs.scandir" "2.1.5"
     fastq "^1.6.0"
 
-"@nomiclabs/hardhat-ethers@2.1.1":
-  version "2.1.1"
-  resolved "https://registry.yarnpkg.com/@nomiclabs/hardhat-ethers/-/hardhat-ethers-2.1.1.tgz#3f1d1ab49813d1bae4c035cc1adec224711e528b"
-  integrity sha512-Gg0IFkT/DW3vOpih4/kMjeZCLYqtfgECLeLXTs7ZDPzcK0cfoc5wKk4nq5n/izCUzdhidO/Utd6ptF9JrWwWVA==
+"@nomiclabs/hardhat-ethers@2.2.1":
+  version "2.2.1"
+  resolved "https://registry.yarnpkg.com/@nomiclabs/hardhat-ethers/-/hardhat-ethers-2.2.1.tgz#8057b43566a0e41abeb8142064a3c0d3f23dca86"
+  integrity sha512-RHWYwnxryWR8hzRmU4Jm/q4gzvXpetUOJ4OPlwH2YARcDB+j79+yAYCwO0lN1SUOb4++oOTJEe6AWLEc42LIvg==
 
 "@nomiclabs/[email protected]":
   version "2.0.3"