Bump sequelize from 5.22.3 to 6.3.4
Bumps [sequelize](https://github.com/sequelize/sequelize) from 5.22.3 to 6.3.4.
- [Release notes](https://github.com/sequelize/sequelize/releases)
- [Commits](https://github.com/sequelize/sequelize/compare/v5.22.3...v6.3.4)
Signed-off-by: dependabot-preview[bot]