Ruff and flake8 fixes

[nsoranzo]

Extracted from the Python 3.12 support PR.

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[jmchilton]

This looks so intentional to me - like we did this at some point to avoid ConnectedValue? I can't find evidence of that in the blame logs though. I think it is fine to keep this as is and just revert if there are problems. If this is actually the check we want - I think ideally we should be using is_runtime_value, again not a necessary thing though.

[nsoranzo]

Thanks for the insight!
By looking at the implementation of is_runtime_value:

def is_runtime_value(value):
    return isinstance(value, RuntimeValue) or (
        isinstance(value, dict) and value.get("__class__") in ["RuntimeValue", "ConnectedValue"]
    )

it's clear that it would not avoid ConnectedValue either.
I don't see a reason to avoid it here, but if there is one, then we would need to revert this change or use if isinstance(val, RuntimeValue) and not isinstance(val, ConnectedValue):