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The google/cloud-firestore dependency is only used in the deployment tests (DeployTest.php) and not in the actual function code (index.php). To optimize the Cloud Function's deployment size and cold start performance, this dependency should be moved from the require section to require-dev. Additionally, note that version 2.0 of this library requires PHP 8.0 or higher. If the function is intended to run on older PHP runtimes, this upgrade might cause compatibility issues unless the dependency is moved to require-dev (ensuring it is not installed in the production environment).