chore: Update actions to prevent warnings

[michaelboulton]

Summary by CodeRabbit

• Chores
  • Updated the integration test environment to use a newer container build setup.
  • Simplified integration test setup by removing an unnecessary protocol buffer compiler installation step.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 887b60d5-9c05-45f0-b527-7062b10e9770

📥 Commits

Reviewing files that changed from the base of the PR and between 5d216f1 and 57b9d2c.

📒 Files selected for processing (1)

• .github/workflows/main.yml

Included review availability: Your plan provides up to 4 included reviews per hour; 3 remain after this review.

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📝 Walkthrough

Walkthrough

The integration-tests GitHub Actions job now uses docker/setup-buildx-action v4.3.0 and no longer installs Protoc for the py3-grpc environment.

Changes

Integration workflow

Layer / File(s)	Summary
Update integration test setup .github/workflows/main.yml	The workflow updates the pinned Buildx action and removes the conditional Protoc installation step.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Merge Risk: ⚪ Minimal · up to 57b9d

This localized workflow update has no identified merge-blocking risk and is merge-ready after normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the workflow updates intended to prevent warnings, including the Buildx upgrade and protoc step removal.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/update-actions

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