fix: vortex-layout doc tests require zstd

[danking]

Maybe I am the only one who runs cargo test -p vortex-layout? ci.yml uses --all-features.

[codspeed-hq]

Merging this PR will not alter performance

✅ 1138 untouched benchmarks
⏩ 1265 skipped benchmarks¹

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_{Comparing dk/fix-layout-table-docs (1beee92) with develop (81c0a99)}

Footnotes

1. 1265 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩