fix(dropdown): rename popup attribute to aria-controls

[ashleyryan]

PR Checklist

Please check if your PR fulfills the following requirements:

• [x] Tests for the changes have been added (for bug fixes / features)
• [x] Docs have been added / updated (for bug fixes / features)
• [ ] If applicable, have a visual design approval

PR Type

What kind of change does this PR introduce?

• [x] Bugfix
• [ ] Feature
• [ ] Code style update (formatting, local variables)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] CI related changes
• [x] Documentation content changes
• [ ] clarity.design website / infrastructure changes
• [ ] Other... Please describe:

What is the current behavior?

The popup attribute conflicts with the Popup API that chromium has started implementing and results in errors logged in the console. See development status: https://chromestatus.com/feature/5463833265045504

Issue Number: #140

What is the new behavior?

This renames the attribute to aria-controls, which is semantically correct. This is a breaking change

Does this PR introduce a breaking change?

• [x] Yes
• [ ] No

Applications will lose aria attribute setting if they don't rename the attribute in their code. The component is a beta components so this change should be acceptable.

Other information

[github-actions[bot]]

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[github-actions[bot]]

:tada: This PR is included in version 6.2.0 :tada:

The release is available on:

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• v6.2.0

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[github-actions[bot]]

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