[SKIP SOF-TEST] .github: really disable spar-se instead of breaking it #10424
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Fixes commit 56649f6 ("github: workflows: disable sparse checks temporarily") which caused a syntax error
GitHub jobs can be disabled one by one but not all at once: https://docs.github.com/en/actions/reference/workflows-and-actions/workflow-syntax#jobsjob_idif
This syntax error was found by Copilot; quoting the original PR:
This has blocked daily tests from running for ages:
https://github.com/thesofproject/sof/actions/runs/20048113632