chore(deps): update dependency google-cloud-firestore to v2.7.2

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
google-cloud-firestore	==2.7.1 -> ==2.7.2

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Release Notes

googleapis/python-firestore

### [`v2.7.2`](https://togithub.com/googleapis/python-firestore/blob/HEAD/CHANGELOG.md#​272-httpsgithubcomgoogleapispython-firestorecomparev271v272-2022-10-10) [Compare Source](https://togithub.com/googleapis/python-firestore/compare/v2.7.1...v2.7.2) ##### Bug Fixes - **deps:** Allow protobuf 3.19.5 ([#​648](https://togithub.com/googleapis/python-firestore/issues/648)) ([9ffbd75](https://togithub.com/googleapis/python-firestore/commit/9ffbd759772dbb3c34054fd2a0cf6c99a1a060f6))

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