fix: packages/contracts-core/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-ELLIPTIC-8187303
- https://snyk.io/vuln/SNYK-JS-SECP256K1-8237220
- https://snyk.io/vuln/SNYK-JS-ELLIPTIC-8172694

packages/contracts-core/package.json

@@ -41,7 +41,7 @@
     "@openzeppelin/contracts": "4.9.3",
     "@openzeppelin/contracts-upgradeable": "4.9.3",
     "dotenv": "16.0.1",
-    "solidity-coverage": "0.7.21",
+    "solidity-coverage": "0.8.0",
     "ts-node": "10.8.1"
   }
 }