Update dependency pynacl to v1.6.2 (#486)

This PR contains the following updates:

| Package | Change |
[Age](https://docs.renovatebot.com/merge-confidence/) |
[Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [pynacl](https://redirect.github.com/pyca/pynacl) | `==1.6.1` →
`==1.6.2` |
![age](https://developer.mend.io/api/mc/badges/age/pypi/pynacl/1.6.2?slim=true)
|
![confidence](https://developer.mend.io/api/mc/badges/confidence/pypi/pynacl/1.6.1/1.6.2?slim=true)
|

---

### Release Notes

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

###
[`v1.6.2`](https://redirect.github.com/pyca/pynacl/blob/HEAD/CHANGELOG.rst#162-2026-01-01)

[Compare
Source](https://redirect.github.com/pyca/pynacl/compare/1.6.1...1.6.2)

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

</details>

---

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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==1.6.1
+pynacl==1.6.2
 requests==2.32.5
 smmap==5.0.2
 typing-extensions==4.15.0