fix(deps): update dependency google/cloud-firestore to v2

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Confidence
google/cloud-firestore	^1.25 → ^2.0

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Release Notes

googleapis/google-cloud-php-firestore (google/cloud-firestore)

v2.0.0: google/cloud-firestore v2.0.0

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Miscellaneous Chores

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[gemini-code-assist]

Code Review

This pull request updates the google/cloud-firestore dependency from version 1.25 to 2.0 in composer.json. The review feedback suggests moving this dependency to the require-dev section to optimize the Cloud Function's deployment size and cold start performance, as it is only utilized in deployment tests rather than the production code.

[gemini-code-assist]

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).