Update dependency bootstrap to v5

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
bootstrap	"~> 4.0" → "~> 5.0"

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Release Notes

twbs/bootstrap-rubygem (bootstrap)

v5.3.8

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v5.3.7

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v5.3.6

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v5.3.5

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v5.3.4

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• Autoprefixer is now optional.
  #​283

v5.3.3

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• Adds support for other Sass engines: dartsass-sprockets, dartsass-rails, and cssbundling-rails.

v5.3.2

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v5.3.1

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v5.3.0

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v5.2.3

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v5.2.2

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v5.2.1

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v5.2.0

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v5.1.3

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v5.1.2

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v5.1.1

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v5.1.0

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v5.0.2

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v5.0.1

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v5.0.0

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[renovate]

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