fix: update launchdarkly-js-sdk-common to 5.8.1

[kinyoklion]

Requirements

• I have added test coverage for new or changed functionality
• I have followed the repository's pull request submission guidelines
• I have validated my changes against all supported platform versions

Related issues

N/A — routine dependency update.

Describe the solution you've provided

Update launchdarkly-js-sdk-common from 5.4.0 to 5.8.1.

Changes required to accommodate event format changes introduced in js-sdk-common 5.5.0+:

1. Unit test update (LDClient-events-test.js): Custom (track) events now include inline context instead of contextKeys, so updated the assertion accordingly.

2. Contract test capability updates (contract-tests/index.js):

   • Added inline-context-all: custom events now inline the full context (previously only identify and feature events did)
   • Added client-per-context-summaries: summary events are now emitted per-context via MultiEventSummarizer instead of a single aggregated summary
   • Removed anonymous-redaction: js-sdk-common 5.5.0 removed the redactAnonymous parameter from contextFilter.filter() calls in EventProcessor, so anonymous context attributes are no longer redacted in events

Describe alternatives you've considered

N/A

Additional context

Key behavioral changes in js-sdk-common between 5.4.0 and 5.8.1:

• 5.5.0: "Inline context in custom events" — custom events use context instead of contextKeys; summary events split per-context; anonymous redaction removed from feature events
• 5.8.1: Replace uuid dependency with inline implementation

Link to Devin session: https://app.devin.ai/sessions/f3bb526db7cd4ea4a5a41df8a82eaa46
Requested by: @kinyoklion

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Note

Medium Risk
Medium risk because it upgrades the shared SDK core and reflects upstream event-schema behavior changes (custom events now inline context, and contract-test capabilities change), which could affect integrations that rely on emitted event payloads.

Overview
Upgrades launchdarkly-js-sdk-common from 5.4.0 to 5.8.1.

Updates event-related expectations to match the newer common SDK: the track() unit test now asserts custom events carry an inline context object (not contextKeys), and the contract-test service advertises new capabilities (inline-context-all, client-per-context-summaries) while dropping anonymous-redaction.

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