Add missing for-attribute

[Gomez]

We had an a11y audit, these improvements were noted.

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[JeffersonBledsoe]

@plone/volto-accessibility Needs review

[stevepiercy]

The failing changelog check is a lie, and can be ignored. See https://github.com/plone/volto/pull/6232.

The failing tests, however, cannot be ignored and must pass. I restarted them in case it was flaky and temporary.

[Gomez]

Thanks @ichim-david! This is a useful comment, i removed the duplication.

Changelog updated with @stevepiercy comments.

[ichim-david]

@Gomez I'll work on this tomorrow as part of the Salamina sprint.