build(deps): bump pynacl from 1.4.0 to 1.5.0

Bumps [pynacl](https://github.com/pyca/pynacl) from 1.4.0 to 1.5.0.
- [Release notes](https://github.com/pyca/pynacl/releases)
- [Changelog](https://github.com/pyca/pynacl/blob/main/CHANGELOG.rst)
- [Commits](https://github.com/pyca/pynacl/compare/1.4.0...1.5.0)

---
updated-dependencies:
- dependency-name: pynacl
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: Jussi Kukkonen <jkukkonen@vmware.com>

requirements-pinned.txt

@@ -4,7 +4,7 @@ charset-normalizer==2.0.7 # via requests
 cryptography==35.0.0       # via securesystemslib
 idna==3.3                 # via requests
 pycparser==2.20           # via cffi
-pynacl==1.4.0             # via securesystemslib
+pynacl==1.5.0             # via securesystemslib
 requests==2.26.0
 securesystemslib[crypto,pynacl]==0.21.0
 six==1.16.0               # via pynacl, securesystemslib