Bump remark-parse from 8.0.3 to 10.0.1

[myarmolinsky]

Bump remark-parse from 8.0.3 to 10.0.1

Also bumps unified from 9.2.2 to 10.1.2 and adds remark-gfm

Change-type: patch

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Contributor checklist

• I have regenerated jest snapshots for any affected components with npm run generate-snapshots

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