Also failing on charmed-kubernetes-testing while running the K8s validation suite.

==================================== ERRORS ====================================
____________________ ERROR at setup of test_series_upgrade _____________________
Traceback (most recent call last):
  File "/home/ubuntu/k8s-validation/.tox/py3/lib/python3.8/site-packages/pytest_asyncio/plugin.py", line 299, in _asyncgen_fixture_wrapper
    result = event_loop.run_until_complete(setup())
  File "/usr/lib/python3.8/asyncio/base_events.py", line 616, in run_until_complete
    return future.result()
  File "/home/ubuntu/k8s-validation/.tox/py3/lib/python3.8/site-packages/pytest_asyncio/plugin.py", line 281, in setup
    res = await gen_obj.__anext__()
  File "/home/ubuntu/k8s-validation/jobs/integration/conftest.py", line 258, in model
    await model.connect(tools.connection)
  File "/home/ubuntu/k8s-validation/.tox/py3/lib/python3.8/site-packages/juju/model.py", line 658, in connect
    _, model_uuid = await self._connector.connect_model(model_name, **kwargs)
  File "/home/ubuntu/k8s-validation/.tox/py3/lib/python3.8/site-packages/juju/client/connector.py", line 174, in connect_model
    await self.connect(**kwargs)
  File "/home/ubuntu/k8s-validation/.tox/py3/lib/python3.8/site-packages/juju/client/connector.py", line 82, in connect
    raise JujuConnectionError("juju server-version %s not supported" % juju_server_version)
juju.errors.JujuConnectionError: juju server-version 2.9.42 not supported
------------------------------ Captured log setup ------------------------------
WARNING  connector:connector.py:80 This version was tested using 3.1.0 juju version 2.9.42 may have compatibility issues
=============================== warnings summary ===============================
.tox/py3/lib/python3.8/site-packages/invoke/loader.py:3
  /home/ubuntu/k8s-validation/.tox/py3/lib/python3.8/site-packages/invoke/loader.py:3: DeprecationWarning: the imp module is deprecated in favour of importlib; see the module's documentation for alternative uses
    import imp

jobs/integration/conftest.py:626
  /home/ubuntu/k8s-validation/jobs/integration/conftest.py:626: PytestDeprecationWarning: The hookimpl pytest_metadata uses old-style configuration options (marks or attributes).
  Please use the pytest.hookimpl(optionalhook=True) decorator instead
   to configure the hooks.
   See https://docs.pytest.org/en/latest/deprecations.html#configuring-hook-specs-impls-using-markers
    @pytest.mark.optionalhook

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
---------- generated xml file: /home/ubuntu/k8s-validation/report.xml ----------
----- generated html file: file:///home/ubuntu/k8s-validation/report.html ------
========================= 2 warnings, 1 error in 0.76s =========================
ERROR: InvocationError for command /home/ubuntu/k8s-validation/.tox/py3/bin/pytest -v -s --controller=foundations-maas --model=kubernetes-maas /home/ubuntu/k8s-validation/jobs/integration/validation.py::test_series_upgrade --is-series-upgrade --upgrade-snap-channel=latest/stable --upgrade-charm-channel=stable --series=jammy '--vault-unseal-command=fce_wrap build --layer kubernetes-maas --steps vault' (exited with code 1)
___________________________________ summary ____________________________________
ERROR:   py3: commands failed

Test run: https://solutions.qa.canonical.com/v2/testruns/2e6802d6-8699-4816-a791-b83f361a3c24
Artifacts: https://oil-jenkins.canonical.com/artifacts/2e6802d6-8699-4816-a791-b83f361a3c24/index.html