chore: bump pytest-operator from 0.38.0 to 0.39.0

Bumps [pytest-operator](https://github.com/charmed-kubernetes/pytest-operator) from 0.38.0 to 0.39.0.
- [Release notes](https://github.com/charmed-kubernetes/pytest-operator/releases)
- [Commits](https://github.com/charmed-kubernetes/pytest-operator/commits/v0.39.0)

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

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

requirements.txt

@@ -119,7 +119,7 @@ pytest==8.3.4
     #   pytest-operator
 pytest-asyncio==0.21.2
     # via pytest-operator
-pytest-operator==0.38.0
+pytest-operator==0.39.0
     # via -r requirements.in
 python-dateutil==2.9.0.post0
     # via kubernetes