chore(deps): update dependency google.cloud.firestore to v4

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
Google.Cloud.Firestore	3.13.0 → 4.2.0

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Release Notes

googleapis/google-cloud-dotnet (Google.Cloud.Firestore)

v4.2.0: Google.Cloud.Storage.V1 version 4.2.0

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Changes in this release:

New features

• Improve credential support for URL signing. (commit d36a8dd)
• Add DownloadValidationMode.Automatic (commit c9f2b19)
• Support HMAC URL signing. (commit dfad68e)
• Enable self-signed JWTs for Storage and Translation clients (commit 10d2787)
• Add invocation ID and attempt count in x-goog-api-client header. Fixes issue 8881 (commit 1ac6f68)
• Disabled default ExponentialBackOffPolicy in message handler via StorageClientBuilder (commit 62aec51)

Documentation improvements

• Add commentary on accidentally-optional parameters (commit 228bdfc)

v4.1.0: Google.Cloud.Firestore version 4.1.0

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New features

• Publish the pipelines API to the stable branch

Documentation improvements

• Minor api documentation changes

v4.0.0: Google.Cloud.Firestore version 4.0.0

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New features

• Update from System.Linq.Async to System.Linq.AsyncEnumerable

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