The Windows CI fails due to timeout. about optuna HOT 6 OPEN

According to the issue, 0.1.0post1 may be better.

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CI seems to be stuck on the third test in test_contour.py. This is the first test in test_plot_contour, which outputs an image using plotly. I am not sure, but perhaps this issue plotly/Kaleido#110 is related.

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Downgrading kaleido to 0.1.0 will resolve issue according to the comments like plotly/Kaleido#110 (comment). I will hotfix it.

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Unfortunately, kaleido 0.1.0post1 did not resolve this issue. https://github.com/optuna/optuna/actions/runs/6818449794

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In my understanding, there were two problems related to this issue, test_contour.py and test_journal.py. The first one was resolved by Kaleido 0.1.0post1. The second one has not been reproduced in these two months. I think that it is OK to close this issue. If this issue will be reproduced or you have some concerns, please feel free to reopen it.

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I reopen this issue since the problem with test_journal.py recurred. https://github.com/optuna/optuna/actions/runs/8530596405

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