Update dependency @google-cloud/firestore to v5 - autoclosed

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@google-cloud/firestore	^4.15.1 -> ^5.0.2

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Release Notes

googleapis/nodejs-firestore

### [`v5.0.2`](https://togithub.com/googleapis/nodejs-firestore/blob/HEAD/CHANGELOG.md#​502-httpswwwgithubcomgoogleapisnodejs-firestorecomparev501v502-2022-01-07) [Compare Source](https://togithub.com/googleapis/nodejs-firestore/compare/v5.0.1...v5.0.2) ### [`v5.0.1`](https://togithub.com/googleapis/nodejs-firestore/blob/HEAD/CHANGELOG.md#​501-httpswwwgithubcomgoogleapisnodejs-firestorecomparev500v501-2021-12-02) [Compare Source](https://togithub.com/googleapis/nodejs-firestore/compare/v4.15.1...v5.0.1)

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Configuration

📅 Schedule: "after 7am on the first day of the month" (UTC).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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