build(deps): bump github.com/posthog/posthog-go

Bumps the go-dependencies group with 1 update: github.com/posthog/posthog-go.

Updates github.com/posthog/posthog-go from 1.17.5 to 1.18.0

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updated-dependencies:

• dependency-name: github.com/posthog/posthog-go dependency-version: 1.18.0 dependency-type: direct:production update-type: version-update:semver-minor dependency-group: go-dependencies ...