fix: update protobuf monorepo

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Confidence
Google.Protobuf	3.33.1 -> 3.33.2
com.google.protobuf:protobuf-bom (source)	4.33.1 -> 4.33.2

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[gemini-code-assist]

Summary of Changes

Hello @renovate-bot, 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 focuses on maintaining the project's dependencies by updating the protobuf monorepo components for both the .NET and Java wrappers. It ensures that the project benefits from the latest patch releases of these essential libraries, which typically include bug fixes and minor improvements, without introducing breaking changes.

Highlights

• Dependency Update: Google.Protobuf (.NET): The Google.Protobuf package in the .NET gRPC wrapper (spannerlib-dotnet-grpc-v1.csproj) has been updated from version 3.33.1 to 3.33.2.
• Dependency Update: protobuf-bom (Java): The com.google.protobuf:protobuf-bom dependency in the Java wrapper (spannerlib-java/pom.xml) has been updated from version 4.33.1 to 4.33.2.

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[gemini-code-assist]

Code Review

This pull request updates the protobuf dependencies for both the Java and .NET projects to their latest patch versions. The changes correctly update Google.Protobuf to version 3.33.2 in the .NET project file and protobuf-bom to version 4.33.2 in the Java pom.xml. These are routine dependency updates, and the changes look correct. No issues were found.