Update ruby/setup-ruby action to v1.278.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	Pending
ruby/setup-ruby	action	minor	v1.276.0 → v1.278.0	v1.280.0 (+1)

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Release Notes

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

v1.278.0

Compare Source

What's Changed

• Set BUNDLER_VERSION whenever we know which version to use by @​eregon in #​849

Full Changelog: ruby/setup-ruby@v1.277.0...v1.278.0

v1.277.0

Compare Source

What's Changed

• Update CRuby releases on Windows by @​ruby-builder-bot in #​847

Full Changelog: ruby/setup-ruby@v1.276.0...v1.277.0

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Configuration

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