chore: update yarn to v4.9.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
yarn (source)	4.6.0 -> 4.9.1

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Release Notes

yarnpkg/berry (yarn)

v4.9.1

Compare Source

v4.9.0

Compare Source

v4.8.1

Compare Source

v4.8.0

Compare Source

v4.7.0

Compare Source

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Configuration

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Latest commit: 23ac6c0

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[github-actions]

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Review the following VRT differences

When a visual regression test fails (or has previously failed while working on this branch), its results can be found in the following URLs:

• Spectrum | Light | Medium | LTR
• Spectrum | Dark | Large | RTL
• Express | Light | Medium | LTR
• Express | Dark | Large | RTL
• Spectrum-two | Light | Medium | LTR
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If the changes are expected, update the current_golden_images_cache hash in the circleci config to accept the new images. Instructions are included in that file.
If the changes are unexpected, you can investigate the cause of the differences and update the code accordingly.

[castastrophe]

Pulled this down, no issues installing yarn or running build or start. If tests pass, I feel confident in this update. I read through the changes and none seem to particularly impact our workflows.

[github-actions]

Tachometer results

Currently, no packages are changed by this PR...

[nikkimk]

Lyrics garbled terrible musical (LGTM)