Update OFO demos to v1beta1, and lock OFO to specific version

[toddbaert]

The OFO demo currently pulls in the latest (0.5.3) version of OFO, but uses deprecated CRs, so things don't work. The migrations here) should be applied to the CRs.

We should also lock the version of OFO used to a specific one, so that this doesn't happen again.

[agardnerIT]

See open-feature/open-feature-operator#579 (comment)