Utilize pitt version of rac_schemas

[kcloud]

Is your feature request related to a problem? Please describe.

Pending upstream ticket RockefellerArchiveCenter/pisces#523 , we need the ability to validate using a proper schema.

Describe the solution you'd like

Previously we've maintained a local Pypi distribution. Instead, we've chosen to fork the rac_schemas repository available https://github.com/RockefellerArchiveCenter/rac_schemas.

Describe alternatives you've considered

Mentioned above

Additional context

This local is expected to be transient pending upstream development.