chore(deps): update dependency ethers to v5.5.1 (#48)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

package.json

@@ -38,7 +38,7 @@
         "chai-bn": "0.3.0",
         "chai-ethers": "0.0.1",
         "dotenv": "10.0.0",
-        "ethers": "5.4.7",
+        "ethers": "5.5.1",
         "hardhat": "2.6.6",
         "hardhat-deploy": "0.9.4",
         "mocha-skip-if": "0.0.3",