[Snyk] Security upgrade react-markdown from 4.3.1 to 5.0.0

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • demo/package.json
  • demo/package-lock.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	661/1000 Why? Recently disclosed, Has a fix available, CVSS 7.5	Regular Expression Denial of Service (ReDoS) SNYK-JS-TRIM-1017038	Yes	No Known Exploit

(*) Note that the real score may have changed since the PR was raised.

Commit messages

Package name: react-markdown

The new version differs by 18 commits.

• 45b9977 5.0.0
• eeea3c2 Update `changelog.md`
• 5d6c9f1 Refactor scripts
• d29478f Add type tests
• 4f5dbe2 Add note
• 7a5e3a1 Add `allowDangerousHtml`, preferred over `escapeHtml`
• 2675ae2 Remove docs on `source`
• 34b0883 Change default branch to `main`
• 22a5e49 Refactor and test for 100% coverage
• b3aa6e0 Rewrite readme for unified, more examples
• a9f163d Move demo to `website` branch
• 4f1a407 Change to clean project, update, refactor scripts
• ebebf51 Upgrade remark to version 8, unified to version 9
• e400f6f Upgrade to remark-parse@6
• 3260f57 Run tests on node 12
• 6eff8d1 Pass AST node to all non-tag/non-fragment renderers as prop
• ca25be1 Fix link to demo in readme
• 9b4eb84 Updated remark-parse github link (#447)

See the full diff

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