Ruff set python version and enable more rules

[tdadela]

1. Set python target-version for ruff.
2. Enable FA102 rule (Checks for uses of PEP 585- and PEP 604-style type annotations in Python modules that lack the required from future import annotations import for compatibility with older Python versions).
3. Enable pyupgrade rules.
4. Make code compatible with rules.

[cyberw]

Nice! One small comment, then it is good to go.

[tdadela]

What do you think about also enabling isort-like "unsorted-imports (I001)" rule?
(https://docs.astral.sh/ruff/rules/unsorted-imports/)

[cyberw]

What do you think about also enabling isort-like "unsorted-imports (I001)" rule? (https://docs.astral.sh/ruff/rules/unsorted-imports/)

Sounds good! I tried using isort a little, but in some cases (locustfiles) we need to ensure locust is imported before other things (because of gevent monkeypatching). If that can be solved then great!