Bump posthog from 3.7.5 to 3.8.3

Bumps [posthog](https://github.com/posthog/posthog-python) from 3.7.5 to 3.8.3.
- [Release notes](https://github.com/posthog/posthog-python/releases)
- [Changelog](https://github.com/PostHog/posthog-python/blob/master/CHANGELOG.md)
- [Commits](PostHog/posthog-python@v3.7.5...v3.8.3)

---
updated-dependencies:
- dependency-name: posthog
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>