Fix indentation of if: in zizmor SARIF upload step

The `if:` key on the "Upload SARIF results to code scanning" step had no
indentation, producing invalid YAML ("Nested mappings are not allowed in
compact mappings"). This broke `npm run format-check` (prettier) in Basic
validation.

Indent `if:` to 8 spaces so it nests under the step alongside uses/with.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

.github/workflows/zizmor.yml

@@ -41,7 +41,7 @@ jobs:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Upload SARIF results to code scanning
-if: always() && (github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name == github.repository)
+        if: always() && (github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name == github.repository)
         uses: github/codeql-action/upload-sarif@v3
         with:
           sarif_file: zizmor.sarif