fix: update Cerbos Hub config to correct workDir format

- Replace `workDir` with `git.workDir` in `.cerbos-hub.yaml` for proper configuration
- Ensure alignment with Cerbos Hub GitOps integration requirements

Author: jonphipps

.cerbos-hub.yaml

@@ -2,7 +2,8 @@
 # This connects the repository to Cerbos Hub for GitOps policy management
 ---
 apiVersion: api.cerbos.cloud/v1
-workDir: cerbos/policies
+git:
+  workDir: cerbos
 labels:
   latest:         # 'latest' label pointing to the HEAD of the main branch
     branch: main