chore(deps): upgrade dependency pynacl to >=1.6,<1.7

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
PyNaCl	>=1.3.0,<1.6 -> >=1.6,<1.7

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Release Notes

pyca/pynacl (PyNaCl)

v1.6.0

Compare Source

• 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.

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