Fix type signature for `ActiveRecord::Base.validate` (to better support official Ruby documentation)

[yuzisee]

According to https://guides.rubyonrails.org/v6.0/active_record_validations.html#combining-validation-conditions

the official documentation says you can have if: [Proc.new { |c| c.market.retail? }, :desktop?], so, RBS signatures should reflect that.

[github-actions[bot]]

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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.

[tk0miya]

Thank you for your mention. I sincerely apologize. It completely slipped my mind.

I'm not sure why you added test cases to ActiveRecord in spite of modifying ActiveModel. Is it better to move them to ActiveModel?

[tk0miya]

LGTM for this, but I could not approve this. On my local, reviewing UI is not displayed to me.

@ksss Can you approve this?

[ksss]

@yuzisee @tk0miya Thanks!

[github-actions[bot]]

Thanks for your review, @ksss!

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

[tk0miya]

@ksss thanks!

[yuzisee]

/merge