Add pre-commit hook `pyupgrade` to auto upgrade Python syntax

"A tool (and pre-commit hook) to automatically upgrade syntax for newer versions of the language."

https://github.com/asottile/pyupgrade

https://github.com/asottile/pyupgrade?tab=readme-ov-file#python2-and-old-python3x-blocks

Example `.pre-commit-config.yaml` entry:

```
- repo: https://github.com/asottile/pyupgrade
rev: v3.19.1
hooks:
- id: pyupgrade
args: [--py37-plus]
```

Availability:

- --py36-plus will remove Python <= 3.5 only blocks
- --py37-plus will remove Python <= 3.6 only blocks
so on and so forth

Inspect the repository's existing .pre-commit-config.yaml and identify the Python version policy used by the project. Add the pyupgrade hook with the appropriate --py37-plus-style argument from the issue, then verify that the pre-commit configuration accepts it.

Written by the indexing model from the issue text.