Update dependency view_component to v3.21.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
view_component (source, changelog)	3.20.0 -> 3.21.0

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Release Notes

viewcomponent/view_component (view_component)

v3.21.0

Compare Source

• Updates testing docs to include an example of how to use with RSpec.

  Rylan Bowers

• Add --skip-suffix option to component generator.

  KAWAKAMI Moeki

• Add FreeATS to list of companies using ViewComponent.

  Ilia Liamshin

• Ensure HTML output safety wrapper is used for all inline templates.

  Joel Hawksley

• Expose .identifier method as part of public API.

  Joel Hawksley

• Add rails 8 support to CI.

  Reegan Viljoen

• Updates ActionText compatibility documentation to reference rich_textarea_tag for Rails 8.0 support.

  Alvin Crespo

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