Bump validator and sequelize

Bumps [validator](https://github.com/validatorjs/validator.js) to 13.15.20 and updates ancestor dependency [sequelize](https://github.com/sequelize/sequelize). These dependencies need to be updated together.


Updates `validator` from 5.7.0 to 13.15.20
- [Release notes](https://github.com/validatorjs/validator.js/releases)
- [Changelog](https://github.com/validatorjs/validator.js/blob/master/CHANGELOG.md)
- [Commits](validatorjs/validator.js@5.7.0...13.15.20)

Updates `sequelize` from 3.35.1 to 6.37.7
- [Release notes](https://github.com/sequelize/sequelize/releases)
- [Changelog](https://github.com/sequelize/sequelize/blob/main/CHANGELOG.md)
- [Commits](sequelize/sequelize@v3.35.1...v6.37.7)

---
updated-dependencies:
- dependency-name: validator
  dependency-version: 13.15.20
  dependency-type: indirect
- dependency-name: sequelize
  dependency-version: 6.37.7
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]