Update Yarn to v4.18.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
yarn (source)	4.18.0+sha512.fcb8716fe7cd0eece141ffc18b92193a9df9204c1ba83189c288835223fc0bbe64af473bab0d5e9927a7daeb5caf2bb07eb2787cc9338ca040ea125f2a1f2f7e → 4.18.1

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Configuration

📅 Schedule: (UTC)

• Branch creation
  • "on the first day of the month"
• Automerge
  • At any time (no schedule defined)

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• If you want to rebase/retry this PR, check this box

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[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: yarn.lock

! Corepack is about to download https://repo.yarnpkg.com/4.18.1/packages/yarnpkg-cli/bin/yarn.js
/opt/containerbase/tools/corepack/0.36.0/24.21.0/node_modules/corepack/dist/lib/corepack.cjs:13497
    throw new Error(`Mismatch hashes. Expected ${build[1]}, got ${actualHash}`);
          ^

Error: Mismatch hashes. Expected 107f80e13c40b41597284d03190c56f41a3d72b5c72c9ef799fc634d026ebfc5e89cd5964e97a2f014392637331c9354f4644e4f27303059fc88ebd12195d470, got b2e1e7524f654f2749d32b4ebcb4622473cb5bcbc485df2007e12a154e50162a4d795526768bc5f5b8f81717bfd79deb2472813d86fb5ae2eb551fa9c872b08f
    at installVersion (/opt/containerbase/tools/corepack/0.36.0/24.21.0/node_modules/corepack/dist/lib/corepack.cjs:13497:11)
    at async Engine.ensurePackageManager (/opt/containerbase/tools/corepack/0.36.0/24.21.0/node_modules/corepack/dist/lib/corepack.cjs:13994:32)
    at async Engine.executePackageManagerRequest (/opt/containerbase/tools/corepack/0.36.0/24.21.0/node_modules/corepack/dist/lib/corepack.cjs:14111:25)
    at async Object.runMain (/opt/containerbase/tools/corepack/0.36.0/24.21.0/node_modules/corepack/dist/lib/corepack.cjs:14838:7)

Node.js v24.21.0