workflows: change name of provider

Part of: DEVINFHD-1916

Author: rickystewart

.github/workflows/pr-analyzer-threestage.yml

@@ -23,7 +23,7 @@ jobs:
         with:
           project_id: 'vertex-model-runners'
           service_account: '[email protected]'
-          workload_identity_provider: 'projects/72497726731/locations/global/workloadIdentityPools/ai-review/providers/github'
+          workload_identity_provider: 'projects/72497726731/locations/global/workloadIdentityPools/ai-review/providers/ai-review'
 
       - name: Stage 1 - Initial Bug Screening
         id: stage1