build(deps): bump optuna from 4.2.0 to 4.2.1

[dependabot]

Bumps optuna from 4.2.0 to 4.2.1.

Release notes

Sourced from optuna's releases.

v4.2.1

This is the release note of v4.2.1. This release includes a bug fix addressing an issue where Optuna was unable to import if an older version of the grpcio package was installed.

Bug

• [backport] Use _LazyImport for grpcio package (#5965)

Other

• Bump up version number to v4.2.1 (#5964)

Thanks to All the Contributors!

This release was made possible by the authors and the people who participated in the reviews and discussions. @​c-bata @​HideakiImamura @​nabenabe0928

Commits

• 2e595ac Merge pull request #5965 from HideakiImamura/backport-v4.2.1
• c7d30a7 Merge pull request #5964 from c-bata/bump-up-to-v4.2.1
• 7eca185 Merge pull request #5954 from c-bata/lazy-import-grpcio
• 3a8ddf7 Bump up to version number v4.2.1
• See full diff in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

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Summary by Sourcery

Build:

• Bump Optuna dependency to 4.2.1.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request updates the optuna dependency from version 4.2.0 to 4.2.1. The change is implemented by modifying the version lock file (poetry.lock) to incorporate the bug fix for the grpcio lazy import issue, ensuring that the library can be imported even when an older version of grpcio is installed.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Updated the optuna dependency version to 4.2.1.	Modified the version number within the lock file to reflect the new dependency release. Incorporated the bug fix related to the _LazyImport for the grpcio package.	poetry.lock

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[sourcery-ai]

We have skipped reviewing this pull request. It seems to have been created by a bot (hey, dependabot[bot]!). We assume it knows what it's doing!

[github-actions]

Build Error! No Linked Issue found. Please link an issue or mention it in the body using #<issue_id>

[lisphilar]

@dependabot rebase

[dependabot]

Dependabot tried to update this pull request, but something went wrong. We're looking into it, but in the meantime you can retry the update by commenting @dependabot rebase.