chore: update Node server SDK minimum to 9.12.1

[devin-ai-integration]

Summary

Update @launchdarkly/node-server-sdk from >= 9.0.0 to ^9.12.1, raising the minimum to the latest npm release while keeping resolution within major version 9.

No deprecated API usage was found, and the latest published SDK major remains 9.

Testing

• npm install (resolved @launchdarkly/node-server-sdk@9.12.1)
• node --check index.js
• npm audit --omit=dev (0 vulnerabilities)
• CI=1 node --trace-deprecation index.js with the example SDK key (initialized successfully, evaluated the absent default sample-feature flag as false, and emitted no deprecation warnings)

Link to Devin session: https://app.devin.ai/sessions/6b3a521163824aed999951dbe118dbf8

---

Note

Low Risk
Dependency-only change in a sample app; no logic or API usage updates.

Overview
Bumps @launchdarkly/node-server-sdk from >= 9.0.0 to ^9.12.1, so installs resolve to at least 9.12.1 while staying on major 9. No application or SDK usage changes—only the dependency range in package.json.

^{Reviewed by Cursor Bugbot for commit 1e5d90c. Bugbot is set up for automated code reviews on this repo. Configure here.}

[devin-ai-integration]

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[devin-ai-integration]

Closing: no update needed. The existing constraint @launchdarkly/node-server-sdk: >= 9.0.0 already permits the latest 9.x (currently 9.12.3), and no package-lock is committed, so npm install already resolves to the latest compatible version. Raising the floor to ^9.12.1 isn't required.