Update isort to the latest version
Signed-off-by: Vladimir Bataev <vbataev@nvidia.com>

# What does this PR do ?

Update `isort` to the latest version

**Collection**: [Note which collection this PR will affect]

# Changelog 
- update `isort` to the latest version
- apply latest `isort` to the codebase

# Usage
```shell
isort .  # one can simply use `isort` command to fix all files or provided paths
python setup.py style --fix  # also will work for isort + black, as previously
```


# 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)
- [ ] Did you write any new necessary tests?
- [ ] Did you add or update any necessary documentation?
- [ ] 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**:
- [ ] New Feature
- [ ] Bugfix
- [ ] Documentation

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


## 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
* Related to #5893 
