fix: upgrade dotenv from 16.3.1 to 16.4.1

Snyk has created this PR to upgrade dotenv from 16.3.1 to 16.4.1.

See this package in npm:
https://www.npmjs.com/package/dotenv

See this project in Snyk:
https://app.snyk.io/org/maidul98/project/35057e82-ed7d-4e19-ba4d-719a42135cd6?utm_source=github&utm_medium=referral&page=upgrade-pr

backend/package.json

@@ -95,7 +95,7 @@
     "axios-retry": "^4.0.0",
     "bcrypt": "^5.1.1",
     "bullmq": "^5.1.6",
-    "dotenv": "^16.3.1",
+    "dotenv": "^16.4.1",
     "fastify": "^4.26.0",
     "fastify-plugin": "^4.5.1",
     "handlebars": "^4.7.8",