Pytest-is-running

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* Mark as unmaintained.

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* Drop Python 3.7 support.

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* Support Python 3.12.

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* Remove dependency on pytest.

Thanks to Luke Plant for the report in `Issue 54 <https://github.com/adamchainz/pytest-is-running/issues/54>`__.

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* Support Python 3.11.

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* Drop Python 3.6 support.