Bump sequelize from 5.22.3 to 6.28.2

Bumps [sequelize](https://github.com/sequelize/sequelize) from 5.22.3 to 6.28.2.
- [Release notes](https://github.com/sequelize/sequelize/releases)
- [Commits](sequelize/sequelize@v5.22.3...v6.28.2)

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

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

Author: dependabot[bot]