tests: ensure tests run with protobuf 7.x

[parthea]

Towards googleapis/google-cloud-python#16001

[gemini-code-assist]

Summary of Changes

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This pull request updates a key dependency constraint within the testing templates to ensure compatibility with newer versions of protobuf. Specifically, the minimum required protobuf version for testing environments has been raised to 7.x, which is essential for addressing ongoing compatibility issues and maintaining robust test coverage for the google-cloud-python project.

Highlights

• Protobuf Dependency Update: Updated the minimum required version for protobuf from 6 to 7 in the constraints-3.14.txt.j2 template. This ensures that generated tests are compatible with and run against protobuf version 7.x.

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[gemini-code-assist]

Code Review

This pull request updates the minimum required version for the protobuf library from 6 to 7 in the constraints-3.14.txt.j2 template. There are no review comments to address.

[ohmayr]

Notice: Migration in Progress

This repository is being consolidated into the google-cloud-python mono-repo. We are closing this PR here to prevent "split-brain" development during the transition.

What happens next?

• Your work has been captured in our migration snapshot.

• We are evaluating all active PRs for manual porting into the new location: packages/gapic-generator-python/.

• You can track the porting status and the technical migration plan here: [gapic-generator] Port active PRs and logic from legacy gapic-generator-python repository google-cloud-python#16182