Virtualenv

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- Upgrade embedded wheels:

* pip to ``23.2`` from ``23.1.2`` - by :user:`arielkirkwood` (:issue:`2611`)

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- Fix test suite - by :user:`gaborbernat`. (:issue:`2592`)
- Upgrade embedded wheels:

* setuptools to ``68.0.0`` from ``67.8.0`` (:issue:`2607`)

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- update and simplify nushell activation script, fixes an issue on Windows resulting in consecutive command not found - by :user:`melMass`. (:issue:`2572`)
- Upgrade embedded wheels:

* setuptools to ``67.8.0`` from ``67.7.2`` (:issue:`2588`)

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- Prevent ``PermissionError`` when using venv creator on systems that deliver files without user write
permission - by :user:`kulikjak`. (:issue:`2543`)
- Upgrade setuptools to ``67.7.2`` from ``67.6.1`` and pip to ``23.1.2`` from ``23.1`` - by :user:`szleb`. (:issue:`2560`)

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- Drop support for creating Python <=3.6 (including 2) interpreters. Removed pip of ``20.3.4``, ``21.3.1``; wheel of
``0.37.1``; setuptools of ``59.6.0``, ``44.1.1``, ``50.3.2``- by :user:`gaborbernat`. (:issue:`2548`)

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- Add ``tox.ini`` to sdist - by :user:`mtelka`. (:issue:`2511`)
- Move the use of 'let' in nushell to ensure compatibility with future releases of nushell, where 'let' no longer
assumes that its initializer is a full expressions. (:issue:`2527`)
- The nushell command 'str collect' has been superseded by the 'str join' command. The activate.nu script has
been updated to reflect this change. (:issue:`2532`)
- Upgrade embedded wheels:

* wheel to ``0.40.0`` from ``0.38.4``
* setuptools to ``67.6.1`` from ``67.4.0``
* pip to ``23.1`` from ``23.0.1`` (:issue:`2546`)