Update ruby/setup-ruby action to v1.268.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
ruby/setup-ruby	action	minor	v1.264.0 -> v1.268.0

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Release Notes

ruby/setup-ruby (ruby/setup-ruby)

v1.268.0

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What's Changed

• Add ruby-4.0.0-preview2 by @​ruby-builder-bot in #​825

Full Changelog: ruby/setup-ruby@v1.267.0...v1.268.0

v1.267.0

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What's Changed

• Scale bundler install jobs with CPU count up to 8 by @​thomasbreland in #​822

New Contributors

• @​thomasbreland made their first contribution in #​822

Full Changelog: ruby/setup-ruby@v1.266.0...v1.267.0

v1.266.0

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What's Changed

• Add ruby-3.3.10 by @​ruby-builder-bot in #​819
• Update CRuby releases on Windows by @​ruby-builder-bot in #​821

Full Changelog: ruby/setup-ruby@v1.265.0...v1.266.0

v1.265.0

Compare Source

What's Changed

• Update CRuby releases on Windows by @​ruby-builder-bot in #​817

Full Changelog: ruby/setup-ruby@v1.264.0...v1.265.0

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