chore: update LaunchDarkly SDKs and gem lockfile to latest within-major

[devin-ai-integration]

Summary

Routine dependency refresh for the example: both LaunchDarkly SDKs (Ruby server + browser) and the committed gem lockfile move to the latest versions within their current majors.

• Gemfile.lock: launchdarkly-server-sdk 8.15.0 → 8.15.1 (plus the other bundle update resolutions: rack 3.2.7, rbs 4.2.0, reline 0.7.0, selenium-webdriver 4.48.0, sprockets 4.4.1, etc.)
• config/importmap.rb: @launchdarkly/js-client-sdk pin 4.9.4 → 4.10.0
• No Gemfile constraints changed — ~> 8.10 already permits 8.15.1, and the Ruby version pin (3.3.1) is unchanged
• No deprecated SDK APIs in the example; no deprecation warnings from the server or the browser console

Implementation details

Verified by running the app in a ruby:3.3.1 container against the hello-apps environment (server SDK key + client-side ID via env vars, never committed):

• bundle install, bin/rails db:migrate, bin/rails test → 1 run, 1 assertion, 0 failures
• bin/rails server and loading localhost:3000 in Chrome: both the normal and the bootstrapped browser client render { "hello-boolean": true }, so the bootstrap path works with js-client-sdk 4.10.0
• The incidental db/schema.rb Rails-version-header rewrite produced by db:migrate was reverted so it isn't part of this diff

No open PRs existed on this repo at the time of this change (last run's #90/#91 are closed/merged).

Link to Devin session: https://app.devin.ai/sessions/dbae57d29dc44ef5adc0afe082345bfa
Open in Devin Desktop: https://app.devin.ai/desktop/session/dbae57d29dc44ef5adc0afe082345bfa?variant=devin

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Note

Overview
Bumps LaunchDarkly dependencies without changing Gemfile constraints: the Ruby server SDK in Gemfile.lock moves 8.15.0 → 8.15.1, and the browser client CDN pin in config/importmap.rb moves @launchdarkly/js-client-sdk 4.9.4 → 4.10.0.

The lockfile also picks up incidental bundle update resolutions (e.g. rack 3.2.7, sprockets 4.4.1, selenium-webdriver 4.48.0, reline 0.7.0, rbs 4.2.0, and other transitive gems). No application Ruby or JavaScript source files are modified in this diff.

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[devin-ai-integration]

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