Update dependency symfony/ux-twig-component to v2.21.0

This MR contains the following updates:

Package	Type	Update	Change
symfony/ux-twig-component (source)	require	minor	2.20.0 -> 2.21.0

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Release Notes

symfony/ux-twig-component (symfony/ux-twig-component)

v2.21.0

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