[Snyk] Security upgrade showdown from 1.9.0 to 1.9.1

[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:
  • package.json
  • package-lock.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	686/1000 Why? Proof of Concept exploit, Has a fix available, CVSS 7.3	Prototype Pollution SNYK-JS-Y18N-1021887	No	Proof of Concept

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

Commit messages

Package name: showdown

The new version differs by 4 commits.

• 483e51f release 1.9.1
• 5cc3fcc update dev dependencies
• 1cd281f fix(openLinksInNewWindow): add rel="noopener noreferrer" to links
• 58208e5 update dependencies

See the full diff

Check the changes in this PR to ensure they won't cause issues with your project.

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