homebrew version mismatch

When installing `brew install chainhook`:
- Homebrew reports installing v1.9.0
- The binary reports v1.8.0 when running --version
- But the behavior matches v1.9.0 (requiring the signer database)

```bash
brew install chainhook
Warning: chainhook 1.9.0 is already installed and up-to-date.
chainhook --version
chainhook 1.8.0
```