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>
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