Update dependency @nomiclabs/hardhat-etherscan to v3.1.2

Author: renovate[bot]

package.json

@@ -20,7 +20,7 @@
 	"license": "MPL-2.0",
 	"devDependencies": {
 		"@nomiclabs/hardhat-ethers": "2.1.1",
-		"@nomiclabs/hardhat-etherscan": "3.1.0",
+		"@nomiclabs/hardhat-etherscan": "3.1.2",
 		"@nomiclabs/hardhat-waffle": "2.0.3",
 		"@types/chai": "4.3.4",
 		"@types/dotenv": "8.2.0",

yarn.lock

@@ -996,10 +996,10 @@
   resolved "https://registry.yarnpkg.com/@nomiclabs/hardhat-ethers/-/hardhat-ethers-2.1.1.tgz#3f1d1ab49813d1bae4c035cc1adec224711e528b"
   integrity sha512-Gg0IFkT/DW3vOpih4/kMjeZCLYqtfgECLeLXTs7ZDPzcK0cfoc5wKk4nq5n/izCUzdhidO/Utd6ptF9JrWwWVA==
 
-"@nomiclabs/[email protected].0":
-  version "3.1.0"
-  resolved "https://registry.yarnpkg.com/@nomiclabs/hardhat-etherscan/-/hardhat-etherscan-3.1.0.tgz#7137554862b3b1c914f1b1bf110f0529fd2dec53"
-  integrity sha512-JroYgfN1AlYFkQTQ3nRwFi4o8NtZF7K/qFR2dxDUgHbCtIagkUseca9L4E/D2ScUm4XT40+8PbCdqZi+XmHyQA==
+"@nomiclabs/[email protected].2":
+  version "3.1.2"
+  resolved "https://registry.yarnpkg.com/@nomiclabs/hardhat-etherscan/-/hardhat-etherscan-3.1.2.tgz#1f9af26ce7db437eb705d46a99996811b43d0e4a"
+  integrity sha512-IEikeOVq0C/7CY6aD74d8L4BpGoc/FNiN6ldiPVg0QIFIUSu4FSGA1dmtJZJKk1tjpwgrfTLQNWnigtEaN9REg==
   dependencies:
     "@ethersproject/abi" "^5.1.2"
     "@ethersproject/address" "^5.0.2"