chore: bump pytest-operator from 0.37.0 to 0.38.0

Bumps [pytest-operator](https://github.com/charmed-kubernetes/pytest-operator) from 0.37.0 to 0.38.0.
- [Release notes](https://github.com/charmed-kubernetes/pytest-operator/releases)
- [Commits](https://github.com/charmed-kubernetes/pytest-operator/commits)

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

Signed-off-by: dependabot[bot] <support@github.com>

test-requirements.txt

@@ -121,7 +121,7 @@ pytest-asyncio==0.21.2
     # via
     #   -r test-requirements.in
     #   pytest-operator
-pytest-operator==0.37.0
+pytest-operator==0.38.0
     # via -r test-requirements.in
 python-dateutil==2.9.0.post0
     # via kubernetes