activerecord: Add types for load_async

[dak2]

This method has been added since 7.0

• Implement Relation#load_async to schedule the query on the background thread pool rails/rails#41372
• https://github.com/rails/rails/blob/7-0-stable/activerecord/CHANGELOG.md

[github-actions]

@dak2 Thanks for your contribution!

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activerecord

You changed RBS files for an existing gem.
You need to get approval from the reviewers of this gem.

@hibariya, @ksss, @Little-Rubyist, @tk0miya, please review this pull request.
If this change is acceptable, please make a review comment including APPROVE from here.

After that, the PR author or the reviewers can merge this PR.
Just comment /merge to merge this PR.

[ksss]

APPROVE

[github-actions]

Thanks for your review, @ksss!

@dak2, @ksss This PR is ready to be merged.
Just comment /merge to merge this PR.

[dak2]

/merge

[github-actions]

/merge command failed.

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[dak2]

@ksss

Could you re-review this pr ?

Sorry, I accidentally hit the button to merge main branch.
So the /merge action is now disabled.

[ksss]

APPROVE

[github-actions]

Thanks for your review, @ksss!

@dak2, @ksss This PR is ready to be merged.
Just comment /merge to merge this PR.

[dak2]

/merge

[dak2]

@ksss

Thanks for your help!