fix: upgrade react-markdown from 3.3.0 to 3.6.0

Snyk has created this PR to upgrade react-markdown from 3.3.0 to 3.6.0.

See this package in npm:
https://www.npmjs.com/package/react-markdown

See this project in Snyk:
https://app.snyk.io/org/digitalflow/project/ab660937-292c-4e78-bb0b-1ee4cae7a225?utm_source=github&utm_medium=upgrade-pr

Author: snyk-bot