v3.9.0
chore(deps): bump actions/setup-node from 4.4.0 to 5.0.0 (#11403)
chore(deps): bump actions/checkout from 4 to 5 (#11365)
chore: add cSpell for spell checking (#6456)
chore(deps): bump actions/dependency-review-action from 4.7.2 to 4.7.3 (#11401)
chore(deps): bump actions/github-script from 7.0.1 to 8.0.0 (#11402)
chore: revert Lighthouse numberOfRuns due to bad/verbose reporting (#9448)
chore: drop support for Node 18, that reached End-of-Life (#11408)
feat(search): add runtime support for DocSearch v4 (#11327)