chore: Upgrade eslint to v7

Author: medikoo

package.json

@@ -50,7 +50,7 @@
     "@commitlint/cli": "^9.1.2",
     "@serverless/eslint-config": "^2.2.0",
     "coveralls": "^3.1.0",
-    "eslint": "^6.8.0",
+    "eslint": "^7.7.0",
     "eslint-plugin-import": "^2.22.0",
     "git-list-updated": "^1.2.1",
     "github-release-from-cc-changelog": "^2.2.0",