chore: bump juju from 3.5.2.0 to 3.5.2.1

Bumps [juju](https://github.com/juju/python-libjuju) from 3.5.2.0 to 3.5.2.1.
- [Release notes](https://github.com/juju/python-libjuju/releases)
- [Changelog](https://github.com/juju/python-libjuju/blob/3.5.2.1/docs/changelog.rst)
- [Commits](juju/python-libjuju@3.5.2.0...3.5.2.1)

---
updated-dependencies:
- dependency-name: juju
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -48,7 +48,7 @@ jinja2==3.1.4
     # via
     #   -r requirements.in
     #   pytest-operator
-juju==3.5.2.0
+juju==3.5.2.1
     # via
     #   -r requirements.in
     #   pytest-operator