chore: Upgrade release-please-action from v4 to v5

[devin-ai-integration]

Summary

Upgrade release-please-action from v4.4.0 to v5.0.0 to resolve the Node.js 20 deprecation warning. The only meaningful change in v5 is the runtime bump from node20 to node24; all action inputs/outputs remain identical.

Tracked by: SDK-2319

Review & Testing Checklist for Human

• Verify the workflow file still has correct indentation and formatting
• Optionally trigger the workflow via Actions → Run Release Please → Run workflow on this branch to confirm it runs cleanly on node24

Link to Devin session: https://app.devin.ai/sessions/e58ee26521844473ae277348480a32d1

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Note

Low Risk
Low risk change limited to CI: updates the pinned googleapis/release-please-action version in the release workflow, with no product/runtime code impact.

Overview
Updates the Release Please GitHub Actions workflow to use googleapis/release-please-action v5.0.0 (new pinned commit) instead of v4.4.0, keeping the existing workflow inputs/outputs unchanged.

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[devin-ai-integration]

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