fix: package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-INFLIGHT-6095116

Author: snyk-bot

package.json

@@ -17,7 +17,7 @@
     "@types/mocha": "^9.1.0",
     "chai": "^4.2.0",
     "ethers": "^5.0.0",
-    "hardhat-gas-reporter": "^1.0.8",
+    "hardhat-gas-reporter": "^2.0.0",
     "solidity-coverage": "^0.8.5",
     "ts-node": ">=8.0.0",