Bump markdown2 from 2.3.9 to 2.4.0 in /GUI

[dependabot[bot]]

Bumps markdown2 from 2.3.9 to 2.4.0.

Changelog

Sourced from markdown2's changelog.

python-markdown2 2.4.0

• [pull #377] Fixed bug breaking strings elements in metadata lists
• [pull #380] When rendering fenced code blocks, also add the language-LANG class
• [pull #387] Regex DoS fixes

python-markdown2 2.3.10

• [pull #356] Don't merge sequential quotes into a single blockquote
• [pull #357] use style=text-align for table alignment
• [pull #360] introduce underline extra
• [pull #368] Support for structured and nested values in metadata
• [pull #371] add noopener to external links

Commits

• 3149185 prepare for 2.4.0 release
• 887e958 Update CHANGES.md
• 7b65126 Merge pull request #387 from trentm/regex-dos
• c4b4ccb Be forgiving
• e1954d3 Pretty comment alignment
• 96dff22 Regex DOS fixes
• 330d34c Merge pull request #381 from timgates42/bugfix_typo_because
• b98813f docs: fix simple typo, becase -> because
• cf9c53d Merge pull request #380 from dkasak/fenced-code-block-additional-tag
• b9e3ec7 Pygments test fix for new version
• Additional commits viewable in compare view

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