Integration test fails with Python 3.10 because of version conflict in requirements

Bug Description

I checked out the repository locally and tried to simply run the integration tests for charms/katib-controller with tox. The test fails to install the dependencies because of a version conflict between juju and websocket (see logs below).

This only surfaces when using Python 3.10 - 3.8 runs just fine. However, since 3.10 is the default on jammy I would assume that Python 3.10 should also be supported.

I see (and verified locally) three possible fixes:

Pin the tox testenv version to 3.8 (if 3.10 is not a requirement)
Juju version requirement is set to <4.0 which translates to 3.2.2 on my machine. Pinning the version to 3.1.x would resolve the dependency conflict.
Update the requirements.txt file by rerunning pip-compile requirements-integration.in. This solves the conflict locally for me and is also backward-compatible with Python 3.8

Let me know which solution you'd prefer (if any) and I'll happily open a PR to fix it.

To Reproduce

git checkout git@github.com:canonical/katib-operators.git
cd katib-operators/charms/katib-controller
tox

Environment

Python 3.10
juju 3.1.5
running Juju locally with microK8s 1.25-strict/stable

Relevant Log Output

katib-operators/charms/katib-controller on  main [$] …
➜ tox
...
  Using cached websocket_client-1.6.2-py3-none-any.whl.metadata (7.5 kB)
Collecting websockets==8.1 (from -r requirements-integration.txt (line 203))
  Using cached websockets-8.1.tar.gz (58 kB)
  Preparing metadata (setup.py) ... done
INFO: pip is looking at multiple versions of juju to determine which version is compatible with other requirements. This could take a while.

The conflict is caused by:
    The user requested websockets==8.1
    juju 3.2.2 depends on websockets>=10.0; python_version > "3.9"

To fix this you could try to:
1. loosen the range of package versions you've specified
2. remove package versions to allow pip attempt to solve the dependency conflict

ERROR: Cannot install -r requirements-integration.txt (line 66) and websockets==8.1 because these package versions have conflicting dependencies.
ERROR: ResolutionImpossible: for help visit https://pip.pypa.io/en/latest/topics/dependency-resolution/#dealing-with-dependency-conflicts

integration: exit 1 (6.01 seconds) /home/benjamin/work/katib-operators/charms/katib-controller> python -I -m pip install -r requirements-integration.txt pid=760514
  fmt: OK (1.89=setup[1.71]+cmd[0.07,0.10] seconds)
  lint: OK (2.94=setup[2.50]+cmd[0.07,0.13,0.07,0.17] seconds)
  unit: OK (0.07 seconds)
  integration: FAIL code 1 (6.09 seconds)
  evaluation failed :( (11.02 seconds)

Additional Context

No response

canonical / katib-operators