Update GitHub Actions Runner to 2.334.0

## GitHub Actions Runner Update Available

| | Version |
|---|---|
| **Current** | 2.332.0 |
| **Latest** | 2.334.0 |

### Steps
1. Update `ARG RUNNER_VERSION` in `docker/Dockerfile`
2. Rebuild and test all runner variants
3. Update `docs/VERSION_OVERVIEW.md`

*Auto-created by maintenance workflow*