fix(deps): update dependency @iconify/react to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@iconify/react (source)	^5.0.2 → ^6.0.0

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Warning

Some dependencies could not be looked up. Check the warning logs for more information.

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Configuration

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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: pnpm-lock.yaml

Progress: resolved 1, reused 0, downloaded 0, added 0
 ERR_PNPM_FETCH_404  GET https://registry.npmjs.org/@metronome-sh%2Fdev-error-boundary: Not Found - 404

This error happened while installing a direct dependency of /tmp/renovate/repos/github/AkariNext/www.akarinext.org

@metronome-sh/dev-error-boundary is not in the npm registry, or you have no permission to fetch it.

No authorization header was set for the request.