chore(deps): update dependency @google-cloud/firestore to v6.8.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@google-cloud/firestore	6.4.2 -> 6.8.0

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Release Notes

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

v6.8.0

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Features

• Publish proto definitions for SUM/AVG in Firestore (#​1856) (ac35b37)

Bug Fixes

• deps: Use protobufjs v7.2.5 (#​1889)
• Add tests for multiple inequality support (#​1878) (8e621d5)

v6.7.0

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Features

• Expose MultiDb (#​1857) (1e913db)

Bug Fixes

• Resolving issues with MultiDb support (#​1864) (1af49c1)

v6.6.1

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Bug Fixes

• Updated logging in the client pool and client factory to log information about the required transport and actual transport used. (#​1853) (fe03d02)

v6.6.0

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Features

• Add ApiScope and COLLECTION_RECURSIVE query_scope for Firestore index (#​1849) (b671452)
• Add bloom filter related proto fields (#​1843) (b64e0c1)
• Add support for environment variable FIRESTORE_PREFER_REST (#​1848) (96b1d2a)

v6.5.0

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Features

• OR Queries (#​1800) (983a477)

Bug Fixes

• Enable REST numeric enums (#​1829) (3737696)
• Update generated proto types; fix the update script (#​1825) (a7e4212)

v6.4.3

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Bug Fixes

• deps: Use google-gax v3.5.3 (#​1818) (88981ad)
• Emulator support for system tests. Run system tests against the emulator using: yarn system-test:grpc:emulator or yarn system-test:rest:emulator (8aedc63)
• Update the depth validation used when writing documents, so that it matches the validation of the Firestore backend. (789d9eb)

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