Bump @nomiclabs/hardhat-etherscan from 3.0.3 to 3.0.4 (#161)

Bumps [@nomiclabs/hardhat-etherscan](https://github.com/nomiclabs/hardhat) from 3.0.3 to 3.0.4.
- [Release notes](https://github.com/nomiclabs/hardhat/releases)
- [Commits](https://github.com/nomiclabs/hardhat/compare/@nomiclabs/hardhat-etherscan@3.0.3...@nomiclabs/hardhat-etherscan@3.0.4)

---
updated-dependencies:
- dependency-name: "@nomiclabs/hardhat-etherscan"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -40,7 +40,7 @@
   },
   "devDependencies": {
     "@nomiclabs/hardhat-ethers": "^2.0.6",
-    "@nomiclabs/hardhat-etherscan": "^3.0.3",
+    "@nomiclabs/hardhat-etherscan": "^3.0.4",
     "@nomiclabs/hardhat-solhint": "^2.0.1",
     "@nomiclabs/hardhat-waffle": "^2.0.2",
     "@shardlabs/starknet-hardhat-plugin": "^0.5.3",

yarn.lock

@@ -730,9 +730,9 @@
   version "2.0.6"
   resolved "https://registry.yarnpkg.com/@nomiclabs/hardhat-ethers/-/hardhat-ethers-2.0.6.tgz#1c695263d5b46a375dcda48c248c4fba9dfe2fc2"
 
-"@nomiclabs/hardhat-etherscan@^3.0.3":
-  version "3.0.3"
-  resolved "https://registry.yarnpkg.com/@nomiclabs/hardhat-etherscan/-/hardhat-etherscan-3.0.3.tgz#ca54a03351f3de41f9f5240e37bea9d64fa24e64"
+"@nomiclabs/hardhat-etherscan@^3.0.4":
+  version "3.0.4"
+  resolved "https://registry.yarnpkg.com/@nomiclabs/hardhat-etherscan/-/hardhat-etherscan-3.0.4.tgz#b12e3e226a5b73c4a66d0e6943f948bd093b2711"
   dependencies:
     "@ethersproject/abi" "^5.1.2"
     "@ethersproject/address" "^5.0.2"