chore(deps): update dependency eslint-plugin-promise to v7

Author: renovate[bot]

functions/package-lock.json

@@ -20,7 +20,7 @@
   },
   "devDependencies": {
     "eslint": "^6.8.0",
-    "eslint-plugin-promise": "^4.3.1",
+    "eslint-plugin-promise": "^7.2.1",
     "firebase-functions-test": "^0.3.3"
   },
   "private": true