Bump pynacl from 1.5.0 to 1.6.2 in /docs/sphinx (#379)

Bumps [pynacl](https://github.com/pyca/pynacl) from 1.5.0 to 1.6.2.
- [Changelog](https://github.com/pyca/pynacl/blob/main/CHANGELOG.rst)
- [Commits](https://github.com/pyca/pynacl/compare/1.5.0...1.6.2)

---
updated-dependencies:
- dependency-name: pynacl
  dependency-version: 1.6.2
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

[ROCm/rocshmem commit: fb644ddfa9]

projects/rocshmem/docs/sphinx/requirements.txt

@@ -25,7 +25,7 @@ breathe==4.36.0
     # via rocm-docs-core
 certifi==2025.4.26
     # via requests
-cffi==1.17.1
+cffi==2.0.0
     # via
     #   cryptography
     #   pynacl
@@ -164,7 +164,7 @@ pygments==2.19.1
     #   sphinx
 pyjwt[crypto]==2.10.1
     # via pygithub
-pynacl==1.5.0
+pynacl==1.6.2
     # via pygithub
 python-dateutil==2.9.0.post0
     # via jupyter-client