chore: update TypeScript and @types/node dev dependency pins

[devin-ai-integration]

Summary

Refresh the exact dev-dependency pins to the latest versions within their current major:

-"@types/node": "22.10.1",
-"typescript": "5.7.2"
+"@types/node": "22.20.1",
+"typescript": "5.9.3"

ts-node is already at its latest (10.9.2). The LaunchDarkly SDK constraint is intentionally left alone: "@launchdarkly/node-server-sdk": ">= 9.0.0" already resolves to the latest 9.x (9.13.0) and the repo does not commit package-lock.json, so bumping the floor would be a no-op.

Dev-dependency/build-config only, hence chore: — no shipped code or user-facing requirement changes.

How I tested

• npm i then npx tsc --noEmit index.ts → clean, no type errors or deprecation warnings.
• LAUNCHDARKLY_SDK_KEY=… npm start against a real environment:

info: [LaunchDarkly] Opened LaunchDarkly stream connection
*** SDK successfully initialized!
*** The 'sample-feature' feature flag evaluates to false.

(the flag key does not exist in the test environment, so the default is returned — the SDK initializes and evaluates as expected)

Limitations

Console app, so no screenshots. No deprecated LaunchDarkly SDK APIs are used by index.ts.

Link to Devin session: https://app.devin.ai/sessions/d79f078387654901af6066a98700021e
Requested by: @jsonbailey

[devin-ai-integration]

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