chore(deps): update dependency google.cloud.firestore.admin.v1 to 3.12.0

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
Google.Cloud.Firestore.Admin.V1	3.11.0 -> 3.12.0

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Release Notes

googleapis/google-cloud-dotnet (Google.Cloud.Firestore.Admin.V1)

v3.12.0: Google.Cloud.AIPlatform.V1 version 3.12.0

Compare Source

Changes in this release:

New features

• Add workbench_runtime and kernel_name to NotebookExecutionJob (commit 5835c7c)
• Add new Status field to DeployedModel in Endpoint (commit 4226ced)
• Add new RequiredReplicaCount field to DedicatedResources in MachineResources (commit 4226ced)
• Add Vertex RAG service proto to v1 (commit ebf9b3f)
• Add a v1 UpdateEndpointLongRunning API (commit 69c07c0)
• Add CustomEnvironmentSpec to NotebookExecutionJob (commit 39afa50)

Documentation improvements

• A comment for field encryption_spec in message .google.cloud.aiplatform.v1.NotebookExecutionJob is changed (commit 5835c7c)

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