Fix webapi build script on windows

[natemoo-re]

Changes

• Ran into a problem when debugging with Antony.
• Fixes pnpm run build on Windows.
• CI doesn't catch this because the build only runs on Linux and the generated artifacts are shared with Windows.

Testing

Manually

Docs

N/A, bugfix

[changeset-bot]

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Latest commit: e250bf8

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[matthewp]

lgtm

[FredKSchott]

👍