fix dotenv dependency error

Author: NIDHI2023

package.json

@@ -22,6 +22,7 @@
     "@types/node": "^12.12.15",
     "@types/react-linkify": "^1.0.1",
     "chai": "^4.2.0",
+    "dotenv": "^16.4.7",
     "firebase": "^8.0.1",
     "firebase-admin": "^9.3.0",
     "firebase-functions": "^3.11.0",