[Chore] Fix Windows Monorepo Build

[stevensJourney]

Overview

Currently on Windows the pnpm build:packages command fails with the error:

> [email protected] build:packages C:\Users\steve\Documents\code\powersync-js
> pnpm run --filter './packages/**' -r build

No projects matched the filters in "C:\Users\steve\Documents\code\powersync-js"

This PR updates the PNPM filter syntax which correctly runs the build command on the relevant packages.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 427608b

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[Chriztiaan]

Tested on both windows and mac. LG2M