message: Pin v6.9.x of sequelize to keep SQL query leaks on error
  (avoids unwanted fix of https://github.com/sequelize/sequelize/issues/9456)
diff: "sanitize-filename": "^1.6.3",
  "sanitize-html": "1.4.2",
  "semver": "^7.3.2",
  - "sequelize": "^6.4.0",
  + "sequelize": "~6.9.0",
  "sequelize-notupdate-attributes": "^1.0.0",
  "serve-index": "^1.9.1",
  "socket.io": "^3.1.0",
  