Removes scikit-learn dependency (isaac-sim#3799)

# Description

This PR removes scikit-learn dependency because we are no longer using
this package anywhere in our code.

scikit-learn package also has prebundled libgomp.so that conflict with
the aarch system default libgomp.so and causing issue for other packages
that tries to use scikit-learn libgomp.

## Type of change

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

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## 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

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Author: ooctipus

source/isaaclab_tasks/config/extension.toml

@@ -1,7 +1,7 @@
 [package]
 
 # Note: Semantic Versioning is used: https://semver.org/
-version = "0.11.4"
+version = "0.11.5"
 
 # Description
 title = "Isaac Lab Environments"

source/isaaclab_tasks/docs/CHANGELOG.rst

@@ -1,6 +1,15 @@
 Changelog
 ---------
 
+0.11.5 (2025-10-22)
+~~~~~~~~~~~~~~~~~~
+
+Removed
+^^^^^^^
+
+* Removed scikit-learn dependency because we are no longer using this package.
+
+
 0.11.4 (2025-10-20)
 ~~~~~~~~~~~~~~~~~~~~