build: fix prettier usage

[wolfy1339]

Prettier is async since v3
This unblocks automated updates

Resolves #ISSUE_NUMBER

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Before the change?

• The build scripts would fail because fs.writeFile() was receiving a Promise

After the change?

• await the call to prettier

Pull request checklist

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)

Does this introduce a breaking change?

Please see our docs on breaking changes to help!

• Yes
• No

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[github-actions]

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[octokitbot]

🎉 This PR is included in version 18.1.0 🎉

The release is available on:

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• npm package (@latest dist-tag)
• npm package (@latest dist-tag)
• npm package (@latest dist-tag)
• npm package (@latest dist-tag)
• npm package (@latest dist-tag)
• npm package (@latest dist-tag)
• npm package (@latest dist-tag)

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