Update Apex commit
# What does this PR do ?

Updates Apex commit used for building and testing to include distributed Adam.

**Collection**:  NLP

# Changelog 
- Update Apex commit in Dockerfile and Jenkinsfile

# Usage

```bash
cd /path/to/nemo
DOCKER_BUILDKIT=1 docker build .
```

# Before your PR is "Ready for review"
**Pre checks**:
- [x] Make sure you read and followed [Contributor guidelines](https://github.com/NVIDIA/NeMo/blob/main/CONTRIBUTING.md)
- [x] Did you write any new necessary tests?
- [x] Did you add or update any necessary documentation?
- [x] Does the PR affect components that are optional to install? (Ex: Numba, Pynini, Apex etc)
  - [ ] Reviewer: Does the PR have correct import guards for all optional libraries?
  
**PR Type**:
- [x] New Feature
- [ ] Bugfix
- [ ] Documentation

## Who can review?

Anyone in the community is free to review the PR once the checks have passed. 
[Contributor guidelines](https://github.com/NVIDIA/NeMo/blob/main/CONTRIBUTING.md) contains specific people who can review PRs to various areas.

# Additional Information
* Enables https://github.com/NVIDIA/NeMo/pull/4487
* The Apex commit corresponds to https://github.com/NVIDIA/apex/pull/1463
* CI fails for https://github.com/NVIDIA/NeMo/pull/4799 since the existing Docker container uses an old Apex commit