typing.Self

[russbiggs]

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Issue Content

Once 3.10 hits EOL we can adopt the more modern typing.Self which is current >=3.11 https://peps.python.org/pep-0673/.

This would allow us to update some of the client return typing:

   def __enter__(self) -> OpenAQ:
        """Enters the context manager, returning the client instance."""
        return self

to

   def __enter__(self) -> Self:
        """Enters the context manager, returning the client instance."""
        return self