feat: use eslint 7

Because eslint-config-prettier does not yet support it.

See prettier/eslint-config-prettier#201

Author: coderbyheart

package-lock.json

@@ -21,8 +21,7 @@
   "devDependencies": {
     "@commitlint/cli": "13.2.1",
     "@commitlint/config-angular": "13.2.0",
-    "@nordicsemiconductor/eslint-config-asset-tracker-cloud-typescript": "8.1.9",
-    "eslint": "8.0.1",
+    "@nordicsemiconductor/eslint-config-asset-tracker-cloud-typescript": "8.1.10",
     "husky": "7.0.4",
     "lint-staged": "11.2.3",
     "pinst": "2.1.6",