Bump sequelize from 5.15.1 to 6.29.0 in /frameworks/JavaScript/koa

Bumps [sequelize](https://github.com/sequelize/sequelize) from 5.15.1 to 6.29.0.
- [Release notes](https://github.com/sequelize/sequelize/releases)
- [Commits](https://github.com/sequelize/sequelize/compare/v5.15.1...v6.29.0)

---
updated-dependencies:
- dependency-name: sequelize
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

frameworks/JavaScript/koa/package.json

@@ -15,6 +15,6 @@
     "mysql2": "1.5.3",
     "pg": "8.5.1",
     "pg-hstore": "2.3.2",
-    "sequelize": "5.15.1"
+    "sequelize": "6.29.0"
   }
 }