fix(audit-bicep): update PSRule environment variable to use Bicep CLI path

Author: pauldotyu

.github/workflows/audit-bicep.yml

@@ -32,7 +32,7 @@ jobs:
           path: infra/bicep
           summary: true
         env:
-          PSRULE_AZURE_BICEP_USE_AZURE_CLI: "true"
+          PSRULE_AZURE_BICEP_PATH: "/usr/local/bin/bicep"
 
       - name: Upload alerts to Security tab
         uses: github/codeql-action/upload-sarif@ff0a06e83cb2de871e5a09832bc6a81e7276941f # v3