# Description

We have been supporting both pickle and yaml storing for configuration.
However, pickle has some security vulnerabilities and we have been
preferring the use of yaml in most cases. Thus, we are removing the
pickle utilities for saving and loading configs.

For more info on pickle: https://docs.python.org/3/library/pickle.html


## Type of change

- Breaking change (existing functionality will not work without user
modification)


## Checklist

- [x] I have read and understood the [contribution
guidelines](https://isaac-sim.github.io/IsaacLab/main/source/refs/contributing.html)
- [x] I have run the [`pre-commit` checks](https://pre-commit.com/) with
`./isaaclab.sh --format`
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [x] I have updated the changelog and the corresponding version in the
extension's `config/extension.toml` file
- [x] I have added my name to the `CONTRIBUTORS.md` or my name already
exists there

---------
Signed-off-by: Kelly Guo <kellyg@nvidia.com>
Co-authored-by: Mayank Mittal <12863862+Mayankm96@users.noreply.github.com>