[Ops] Bump node-sass from v8.0.0 to v9.0.0

[watson]

Only breaking change is dropped support for Node.js 14. See release notes: https://github.com/sass/node-sass/releases/tag/v9.0.0

[kibana-ci]

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[watson]

Turns out sass-loader, which uses node-sass, doesn't support this new version (technically it does, but it has a version check that throws, which means it doesn't even try 🙄). So we'd have to upgrade sass-loader to a newer version first, but the next version of sass-loader requires Webpack 5 (#89741), which we're not using yet, so this PR is blocked because of it. So maybe it's easier to just replace node-sass with sass 🤷 (#161813)