fix: backend/package.json & backend/package-lock.json to reduce vulne…

…rabilities (#2258)

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-NODEMAILER-6219989
- https://snyk.io/vuln/SNYK-JS-SEQUELIZETYPESCRIPT-6085300

Co-authored-by: snyk-bot <snyk-bot@snyk.io>

backend/package.json

@@ -59,15 +59,15 @@
     "module-alias": "2.2.2",
     "moment": "^2.29.4",
     "nanoid": "3.3.6",
-    "nodemailer": "6.7.5",
+    "nodemailer": "6.9.9",
     "papaparse": "5.2.0",
     "pg": "8.5.1",
     "pg-connection-string": "2.4.0",
     "rate-limit-redis": "2.1.0",
     "redis": "3.1.2",
     "reflect-metadata": "0.1.13",
     "sequelize": "6.29.1",
-    "sequelize-typescript": "2.1.3",
+    "sequelize-typescript": "2.1.6",
     "source-map-support": "0.5.19",
     "starkbank-ecdsa": "1.1.4",
     "swagger-ui-express": "4.6.3",