chore(renovate): add internalChecksFilter strict to ruby setup group

[mensfeld]

Ensures Renovate waits until both ruby and ruby/setup-ruby have cleared the minimumReleaseAge window before creating the grouped PR, preventing partial dependency update PRs that fail CI.

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[Copilot]

Pull request overview

Updates Renovate configuration so the “ruby setup” package rule only groups updates once all internal checks (including minimumReleaseAge) have passed for each dependency in the group. This helps avoid grouped PRs where one update is eligible but the other is still within the minimum age window, which can lead to CI failures.

Changes:

• Add internalChecksFilter: "strict" to the existing “ruby setup” grouped packageRules entry.

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