chore(tpu): update package dependencies

[angelcaamal]

Description

Fixes Internal: b/549316417

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Checklist

• I have followed guidelines from CONTRIBUTING.MD and Samples Style Guide
• Tests pass: npm test (see Testing)
• Lint pass: npm run lint (see Style)
• Required CI tests pass (see CI testing)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• This pull request is from a branch created directly off of GoogleCloudPlatform/nodejs-docs-samples. Not a fork.
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new sample directory, and I created GitHub Actions workflow for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

Note: Any check with (dev), (experimental), or (legacy) can be ignored and should not block your PR from merging (see CI testing).

[gemini-code-assist]

Code Review

This pull request updates the @google-cloud/tpu and c8 dependencies in tpu/package.json. The review feedback correctly highlights that both upgraded packages require Node.js >= 18.0.0, which conflicts with the current engine requirement of >=16.0.0. To resolve this, the engines.node field in package.json should be updated to >=18.0.0.

[gemini-code-assist]

The upgrade of @google-cloud/tpu to ^4.0.0 requires Node.js >= 18.0.0. This is incompatible with the current "engines": { "node": ">=16.0.0" } specified on line 6. The engines.node field needs to be updated to >=18.0.0 to support this package version.

References

1. When a dependency upgrade requires a higher Node.js version than currently specified in 'engines.node', consider upgrading the 'engines.node' requirement to a supported version (e.g., '>= 18' or '>= 20') instead of reverting the dependency version.

[gemini-code-assist]

Similarly, c8 version ^12.0.0 also requires Node.js >= 18.0.0. Consider upgrading the engines.node requirement to >=18.0.0 to support this and other upgraded dependencies.

References

1. When a dependency upgrade requires a higher Node.js version than currently specified in 'engines.node', consider upgrading the 'engines.node' requirement to a supported version (e.g., '>= 18' or '>= 20') instead of reverting the dependency version.