# Description

With recent upgrade to Python 3.10, the linter was forcing changing of
types to use the new syntax that uses "|" operator.

This means that the line in `base_env.py` was getting converted to this
type as well:

```python
# old
VecEnvObs = Dict[str, torch.Tensor | Dict[str, torch.Tensor]]

# new
VecEnvObs = dict[str, torch.Tensor | dict[str, torch.Tensor]]
```

Unfortunately, Pytorch does not support this type of alias yet. This
leads to errors when building the documentation. The MR reverts to the
old setting and disables `pyupgrade` linter check for that file
(currently not possible to disable the linter for a line itself).

Fixes #432

## 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 run all the tests with `./orbit.sh --test` and they pass
- [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