Update GitHub Actions versions to use Node 20 about optuna HOT 4 CLOSED

can you assign this issue to me??

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@HarshitNagpal29 Thank you for your comment. You can work on this issue since no one is assigned to this issue and https://github.com/optuna/optuna/blob/master/CONTRIBUTING.md does not have such a rule.

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@nzw0301 Thanks for your comments
@HarshitNagpal29 Thank you for your suggestion. Feel free to work on it. However, please note that we still need to list all the files that need updating and examine how the update affects the current CI in this issue.

from optuna.

However, please note that we still need to list all the files that need updating and examine how the update affects the current CI in this issue.

@Alnusjaponica Ok sir, I will try to do that, I was thinking of updating all the files once and then try to check how each file is behaving, while CI run check.

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