Update ProGuard config of the sample app

[0xnm]

What does this PR do?

Without that Sample app is crashing when minification is enabled because of the Netty (it is using a lot of reflection).

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-09T14:00:45.309535Z	f18e13d	PR opened
🔒 Security Review	✅ Completed 2026-10-09T14:00:54.420156Z	f18e13d	PR opened

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[datadog-datadog-prod-us1-2]

More details

The Netty keep rule preserves classes and members needed for reflective access in the sample’s embedded server. Minified build and runtime behavior remain unverified.

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[datadog-datadog-prod-us1-2]

✅ All CI checks and tests passed. Datadog automation helped this PR pass.

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

🔄 Datadog retried 1 test - 1 passed on retry

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 71.78% (-0.02%)

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