Zope.testbrowser

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- Add support for Python 3.12 and 3.13 as of 3.13b1.

- Drop support for Python 3.7.

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- Drop support for Python 2.7, 3.5, 3.6.

- Drop support for deprecated ``python setup.py test``.

- Add support for Python 3.11.

- Do not break in ``mechRepr`` when using ``<input type="date">``.

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- Ensure all objects have consistent resolution orders.

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- Add support for Python 3.9 and 3.10.

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- Stop sending a ``Referer`` header when ``browser.open`` or
``browser.post`` is called directly. See `issue 87
<https://github.com/zopefoundation/zope.testbrowser/issues/87>`_.

- Add error checking to the setters for ``ListControl.displayValue`` and
``CheckboxListControl.displayValue``: in line with the old
``mechanize``-based implementation, these will now raise
``ItemNotFoundError`` if any of the given values are not found, or
``ItemCountError`` on trying to set more than one value on a single-valued
control. See `issue 44
<https://github.com/zopefoundation/zope.testbrowser/issues/44>`_.

- Fix AttributeError in `add_file` when trying to add to a control which is
not a file upload.