Bump har-validator from 5.1.3 to 5.1.5 (#14580)

Bumps [har-validator](https://github.com/ahmadnassri/node-har-validator) from 5.1.3 to 5.1.5.
- [Release notes](https://github.com/ahmadnassri/node-har-validator/releases)
- [Changelog](https://github.com/ahmadnassri/node-har-validator/blob/master/.releaserc)
- [Commits](https://github.com/ahmadnassri/node-har-validator/compare/v5.1.3...v5.1.5

)

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