Update dependency react-markdown to v5

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
react-markdown	dependencies	major	4.3.1 -> 5.0.2

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Release Notes

remarkjs/react-markdown

v5.0.2

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• 4dadaba
  Fix to allow combining allowedTypes, unwrapDisallowed in types

v5.0.1

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• c3dc5ee
  Fix to not crash on empty text nodes

v5.0.0

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BREAKING

Maintained by unified

This project is now maintained by the unified collective, which also houses the
underlying tools used in react-markdown: hundreds of projects for working with
markdown and markup related things (including MDX).
We have cleaned the project: updated dependencies, improved
docs/tests/coverage/types, cleaned the issue tracker, and fixed a couple of
bugs, but otherwise much should be the same.

Upgrade remark-parse

The parser used in react-markdown has been upgraded to the latest version.
It is now 100% CommonMark compliant: that means it works the same as in other
places, such as Discourse, Reddit, Stack Overflow, and GitHub.
Note that GitHub does extend CommonMark: to match how Markdown works on GitHub,
use the remark-gfm plugin.

• remark-parse@9.0.0
• remark-parse@8.0.0
• remark-parse@7.0.0
• remark-parse@6.0.0

New serializer property: node

A new node prop is passed to all non-tag/non-fragment renderers.
This contains the raw mdast AST node,
which opens up a number of interesting possibilities.
The breaking change is for renderers which blindly spread their props to an
underlying component/tag.
For instance:

<ReactMarkdown renderers={{link: props => <a {...props} />}} … />

Should now be written as:

<ReactMarkdown renderers={{link: ({node, ...props}) => <a {...props} />}} … />

List/list item tight property replaced by spread

Previously, the tight property would hint as to whether or not list items
should be wrapped in paragraphs.
This logic has now been replaced by a new spread property, which behaves
slightly differently.
Read more.

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