Upperbound OmegaConf
Signed-off-by: smajumdar <smajumdar@nvidia.com>

# What does this PR do ?

Fix omegaconf incompatibility.

**Collection**: [Core]

**PR Type**:
- [ ] New Feature
- [x] Bugfix
- [ ] Documentation

If you haven't finished some of the above items you can still open "Draft" PR.


## Who can review?
@ericharper 