Update dependency bootstrap to v5

This MR contains the following updates:

Package	Update	Change
bootstrap	major	'~> 4.6.0' -> '~> 5.3.0'

MR created with the help of gitlab-org/frontend/renovate-gitlab-bot

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Release Notes

twbs/bootstrap-rubygem (bootstrap)

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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