Virtualenv

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- Running virtualenv ``--upgrade-embed-wheels`` crashes - by :user:`gaborbernat`. (`2058 <https://github.com/pypa/virtualenv/issues/2058>`_)

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- Bump embedded pip and setuptools packages to latest upstream supported (``21.0.1`` and ``52.0.0``) - by :user:`gaborbernat`. (`2060 <https://github.com/pypa/virtualenv/issues/2060>`_)

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- Upgrade embedded setuptools to ``51.3.3`` from ``51.1.2`` - by :user:`gaborbernat`. (`2055 <https://github.com/pypa/virtualenv/issues/2055>`_)

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- Bump embed pip to ``20.3.3``, setuptools to ``51.1.1`` and wheel to ``0.36.2`` - by :user:`gaborbernat`. (`2036 <https://github.com/pypa/virtualenv/issues/2036>`_)
- Allow unfunctioning of pydoc to fail freely so that virtualenvs can be
activated under Zsh with set -e (since otherwise ``unset -f`` and
``unfunction`` exit with 1 if the function does not exist in Zsh) - by
:user:`d125q`. (`2049 <https://github.com/pypa/virtualenv/issues/2049>`_)
- Drop cached python information if the system executable is no longer present (for example when the executable is a
shim and the mapped executable is replaced - such is the case with pyenv) - by :user:`gaborbernat`. (`2050 <https://github.com/pypa/virtualenv/issues/2050>`_)

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- On Windows python ``3.7+`` distributions where the exe shim is missing fallback to the old ways - by :user:`gaborbernat`. (`1986 <https://github.com/pypa/virtualenv/issues/1986>`_)
- When discovering interpreters on Windows, via the PEP-514, prefer ``PythonCore`` releases over other ones. virtualenv
is used via pip mostly by this distribution, so prefer it over other such as conda - by :user:`gaborbernat`. (`2046 <https://github.com/pypa/virtualenv/issues/2046>`_)

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- Bump pip to ``20.3.1``, setuptools to ``51.0.0`` and wheel to ``0.36.1`` - by :user:`gaborbernat`. (`2029 <https://github.com/pypa/virtualenv/issues/2029>`_)