CI 'tests-with-optuna-master' failing due to botorch installation issue

[toshihikoyanase]

Description

The CI job tests-with-optuna-master has been consistently failing for the past two weeks. The failures are occurring during the environment setup phase, specifically at the step where botorch is being installed.

Possible Cause

It appears that the CI environment has been automatically updating to the latest Python version, which has recently changed from 3.11 to 3.12. Up until three weeks ago, the tests were running successfully on Python 3.11.

Proposed Hotfix

As a temporary measure to restore the CI to a passing state, we propose pinning the Python version to 3.11 instead of using the latest version. This would be a hotfix and we would need to investigate a more permanent solution to ensure compatibility with future Python versions.

How to Reproduce

See https://github.com/optuna/optuna-dashboard/actions/workflows/python-tests.yml

Python version

3.12

Optuna version

The current master

optuna-dashboard version or git revision

The feature branches corresponding to the PRs

Web browser

N/A

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