fix(deps): update dependency @google-cloud/firestore to v8

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
@google-cloud/firestore	^7.11.6 -> ^8.0.0

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Release Notes

googleapis/nodejs-firestore (@​google-cloud/firestore)

v8.0.0

Compare Source

⚠ BREAKING CHANGES

• Update WithFieldData and PartialWithFieldData to ignore methods on types (#​2294)
• migrate to Node 18 (#​2399)

Features

• Support for index signatures in UpdateData<T> (#​1953) (afa206d)

Bug Fixes

• Update WithFieldData and PartialWithFieldData to ignore methods on types (#​2294) (481430f)

Miscellaneous Chores

• Migrate to Node 18 (#​2399) (e5c3118)

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[renovate]

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