Missing comma in the setup.py file of `omni.isaac.orbit_env` extension (#98)

# Description

Missing comma in the `setup.py` of the extension led to installation
errors when calling `./orbit.sh -i`.

## Type of change

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

## Checklist

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

source/extensions/omni.isaac.orbit_envs/setup.py

@@ -26,7 +26,7 @@ INSTALL_REQUIRES = [
     # gym
     "gym==0.21.0",
     "importlib-metadata~=4.13.0",
-    "setuptools<=66"  # setuptools 67.0 breaks gym
+    "setuptools<=66",  # setuptools 67.0 breaks gym
     # data collection
     "h5py",
 ]