Fix a bug in the useMnemonics hook to make it compatible with textareas

[willglas]

Fix a bug in the useMnemonics hook that makes it incompatible with textarea elements. This bug manifested itself when I was trying to use a MarkdownEditor in an ActionMenu.

Closes #2316

Screenshots

No visual changes.

Merge checklist

• [x] Added/updated tests
• [ ] Added/updated documentation (didn't seem necessary)
• [x] Tested in Chrome
• [x] Tested in Firefox
• [x] Tested in Safari
• [x] Tested in Edge

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[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 304846bc9542c45407a0dc8141b5420ed984c3e5

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

This PR includes changesets to release 1 package

Name	Type
@primer/react	Patch

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[github-actions[bot]]

size-limit report 📦

Path	Size
dist/browser.esm.js	78.81 KB (+0.02% 🔺)
dist/browser.umd.js	79.45 KB (+0.02% 🔺)

[siddharthkp]

Looks CI is failing (linting), we're good to go after that's fixed

[siddharthkp]

👋 Hi! Just checking, is this still useful?