💡 Motivation and Context

This repo still referenced PostHog/posthog-github-action@v0.1 in its GitHub workflow(s). This updates that usage to @v1 so the workflow uses the current supported major version.

💚 How did you test it?

• Verified the workflow reference was updated from PostHog/posthog-github-action@v0.1 to @v1
• Re-scanned workflow files in the repo to confirm there are no remaining PostHog/posthog-github-action references below @v1

📝 Checklist

• I reviewed the submitted code.
• I added tests to verify the changes.
• I updated the docs if needed.
• No breaking change or entry added to the changelog.