fix: package.json & package-lock.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-ANSIREGEX-1583908

Author: snyk-bot

package.json

@@ -31,9 +31,9 @@
     "@oclif/test": "^1",
     "@types/jest": "^25.1.3",
     "chai": "^4.2.0",
-    "eslint": "^6.8.0",
+    "eslint": "^7.0.0",
     "husky": "^4.2.3",
-    "jest": "^25.1.0",
+    "jest": "^26.0.0",
     "lint-staged": "^10.0.8",
     "prettier": "^1.19.1",
     "superagent": "^5.2.2",