Update dependency pynacl to v1.6.1 (#468)

This PR contains the following updates:

| Package | Change | Age | Confidence |
|---|---|---|---|
| [pynacl](https://redirect.github.com/pyca/pynacl) | `==1.6.0` ->
`==1.6.1` |
[![age](https://developer.mend.io/api/mc/badges/age/pypi/pynacl/1.6.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/pynacl/1.6.0/1.6.1?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>pyca/pynacl (pynacl)</summary>

###
[`v1.6.1`](https://redirect.github.com/pyca/pynacl/blob/HEAD/CHANGELOG.rst#161-2025-11-10)

[Compare
Source](https://redirect.github.com/pyca/pynacl/compare/1.6.0...1.6.1)

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

</details>

---

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rebase/retry checkbox.

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---

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---

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requirements.txt

@@ -9,7 +9,7 @@ idna==3.11
 pycparser==2.23
 pygithub==2.8.1
 pyjwt==2.10.1
-pynacl==1.6.0
+pynacl==1.6.1
 requests==2.32.5
 smmap==5.0.2
 typing-extensions==4.15.0