Updates python version in quickstart guide (#497)

see title

## 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
- [X] 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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docs/source/setup/quickstart.rst

@@ -32,8 +32,8 @@ To begin, we first define our virtual environment.
 
 .. code-block:: bash
 
-    # create a virtual environment named env_isaaclab with python3.10
-    conda create -n env_isaaclab python=3.10
+    # create a virtual environment named env_isaaclab with python3.11
+    conda create -n env_isaaclab python=3.11
     # activate the virtual environment
     conda activate env_isaaclab