fix: update protobuf monorepo

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Confidence
Google.Protobuf	3.34.0 → 3.34.1
com.google.protobuf:protobuf-bom (source)	4.34.0 → 4.34.1

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request automates the process of keeping protobuf-related dependencies up-to-date across both .NET and Java components. It ensures that the project benefits from the latest bug fixes and minor improvements in the protobuf libraries, maintaining compatibility and stability.

Highlights

• .NET Protobuf Update: The Google.Protobuf NuGet package in spannerlib-dotnet-grpc-v1.csproj has been updated from version 3.34.0 to 3.34.1.
• Java Protobuf BOM Update: The protobuf-bom Maven dependency in spannerlib-java/pom.xml has been updated from version 4.34.0 to 4.34.1.

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[gemini-code-assist]

Code Review

This pull request updates Protobuf dependencies for both the .NET and Java projects. Specifically, Google.Protobuf is updated from 3.34.0 to 3.34.1, and com.google.protobuf:protobuf-bom is updated from 4.34.0 to 4.34.1. These are minor patch version bumps, which typically include bug fixes and are considered safe. The changes are confined to the respective project configuration files and appear correct.