ci: don't let a job failure prevent other runners

[nektro]

this should prevent scenarios like the past few days where there's been a bunch of missing data from runner fails

eg https://github.com/CanadaHonk/test262.fyi/actions/runs/6917208430

[nektro]

docs for property https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstrategyfail-fast

[CanadaHonk]

Thanks!