Fixes the event for randomizing rigid body material (#1140)

# Description

The current friction randomization event only selects a single random
number in the given range and does not vary them. With the given PR,
this is getting fixed, and there is a sampling of the entire given
range.

## Type of change

- Bug fix (non-breaking change which fixes an issue)

## Screenshots

| Before | After |
| ------ | ----- |
| ![Screenshot from 2024-10-03
22-26-49](https://github.com/user-attachments/assets/d13f86ee-c776-4046-af2e-46be8f271a00)
| ![Screenshot from 2024-10-03
22-27-15](https://github.com/user-attachments/assets/cf0a536d-20d0-47f1-b580-25241049cdd4)
|


## Checklist

- [x] I have run the [`pre-commit` checks](https://pre-commit.com/) with
`./isaaclab.sh --format`
- [x] 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

---------
Co-authored-by: Mayank Mittal <mittalma@leggedrobotics.com>

source/extensions/omni.isaac.lab/config/extension.toml

 [package]
 
 # Note: Semantic Versioning is used: https://semver.org/
-version = "0.24.19"
+version = "0.24.20"
 
 # Description
 title = "Isaac Lab framework for Robot Learning"

source/extensions/omni.isaac.lab/docs/CHANGELOG.rst

 Changelog
 ---------
 
+0.24.20 (2024-10-07)
+~~~~~~~~~~~~~~~~~~~~
+
+Fixes
+^^^^^
+
+* Fixed the :meth:`omni.isaac.lab.envs.mdp.events.randomize_rigid_body_material` function to
+  correctly sample friction and restitution from the given ranges.
+
+
 0.24.19 (2024-10-05)
 ~~~~~~~~~~~~~~~~~~~~