chore(deps): Bump validator and sequelize in /step06

Bumps [validator](https://github.com/validatorjs/validator.js) to 13.15.23 and updates ancestor dependency [sequelize](https://github.com/sequelize/sequelize). These dependencies need to be updated together.


Updates `validator` from 10.11.0 to 13.15.23
- [Release notes](https://github.com/validatorjs/validator.js/releases)
- [Changelog](https://github.com/validatorjs/validator.js/blob/master/CHANGELOG.md)
- [Commits](validatorjs/validator.js@10.11.0...13.15.23)

Updates `sequelize` from 5.21.2 to 5.22.5
- [Release notes](https://github.com/sequelize/sequelize/releases)
- [Commits](sequelize/sequelize@v5.21.2...v5.22.5)

---
updated-dependencies:
- dependency-name: validator
  dependency-version: 13.15.23
  dependency-type: indirect
- dependency-name: sequelize
  dependency-version: 5.22.5
  dependency-type: direct:production
...

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

Author: dependabot[bot]