Virtualenv

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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`)

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- Upgrade embedded wheels:

* setuptools to ``75.3.0`` from ``75.2.0`` (:issue:`2798`)
- Upgrade embedded wheels:

* wheel to ``0.45.0`` from ``0.44.0``
* setuptools to ``75.5.0`` (:issue:`2800`)
- no longer forcibly echo off during windows batch activation (:issue:`2801`)
- Upgrade embedded wheels:

* setuptools to ``75.6.0`` from ``75.5.0``
* wheel to ``0.45.1`` from ``0.45.0`` (:issue:`2804`)