early return for index out of bounds in actionbar

[keithamus]

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What are you trying to accomplish?

Spotted some errors in GitHub.com's error reporting software that showed these methods can sometimes be called with OOB indexes. I don't know why, but to prevent the error from occurring we should guard these calls.

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• Fixes axe scan violation - This change fixes an existing axe scan violation.
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Merge checklist

• Added/updated tests
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• Tested in Chrome
• Tested in Firefox
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🦋 Changeset detected

Latest commit: 548e826

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

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@primer/view-components	Patch

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