feat: add new shadow token for copyright text on images

[coraliefeil]

Description:

Definition of Reviewable:

• [ ] Documentation is created/updated
• [ ] Migration Guide is created/updated
• [ ] E2E tests (features, a11y, bug fixes) are created/updated
• [ ] Stories (features, a11y) are created/updated
• [ ] relevant tickets are linked

[coraliefeil]

@solid-design-system/development cpuld s.o. merge this, pls?

Thanks!

[github-actions[bot]]

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