chore(deps): update dependency posthog-node to v5

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	OpenSSF
posthog-node (source)	dependencies	major	4.18.0 -> 5.0.0

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Release Notes

PostHog/posthog-js-lite (posthog-node)

v5.0.0

Compare Source

Removed

1. Remove is_simple_flag from PostHogFeatureFlag type
2. Remove captureMode in favor of json capture mode only
3. Remove deprecated personProperties and groupProperties in favor of setPersonPropertiesForFlags and setGroupPropertiesForFlags

## Breaking changes

1. feat: migrate to native fetch, Node 20+ required

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