Update pynacl to 1.6.2

[pyup-bot]

This PR updates pynacl from 1.5.0 to 1.6.2.

Changelog

1.6.2

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* Updated ``libsodium`` to 1.0.20-stable (2025-12-31 build) to resolve
``CVE-2025-69277``.

1.6.1

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* The ``MAKE`` environment variable can now be used to specify the ``make``
binary that should be used in the build process.

1.6.0

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* **BACKWARDS INCOMPATIBLE:** Removed support for Python 3.6 and 3.7.
* Added support for the low level AEAD AES bindings.
* Added support for ``crypto_core_ed25519_from_uniform``.
* Update ``libsodium`` to 1.0.20-stable (2025-08-27 build).
* Added support for free-threaded Python 3.14.
* Added support for Windows on ARM wheels.

Links

• PyPI: https://pypi.org/project/pynacl
• Changelog: https://data.safetycli.com/changelogs/pynacl/
• Repo: https://github.com/pyca/pynacl/