Virtualenv

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- Ignore unreadable directories in ``PATH``. (:issue:`2794`)

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- Remove old virtualenv wheel from the source distribution - by :user:`gaborbernat`. (:issue:`2841`)
- Upgrade embedded wheel pip to ``25.0.1`` from ``24.3.1`` - by :user:`gaborbernat`. (:issue:`2843`)

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- Fix PyInfo cache incompatibility warnings - by :user:`robsdedude`. (:issue:`2827`)

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- Upgrade embedded wheels:

* setuptools to ``75.8.0`` from ``75.6.0`` (:issue:`2823`)

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- Skip tcsh tests on broken tcsh versions - by :user:`gaborbernat`. (:issue:`2814`)

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- Write CACHEDIR.TAG file on creation - by "user:`neilramsay`. (:issue:`2803`)